Free AI tools
These are the tools in our directory that offer a free plan or a free tier. We include a tool when our pricing data lists it as free, or when we tagged it as having a free tier. That is all “free” means here: it does not mean unlimited, it does not mean no sign-up, and it does not mean the free plan will stay as it is. Usage caps and the features that sit behind a paid plan differ from tool to tool, so read the pricing detail on each row and then check the vendor's own pricing page before you build anything on it. Right now the list has 302 tools: 243 priced as free outright and 59 with a free tier alongside paid plans. Tools are grouped by category, and every row shows the date we last checked that tool's profile.
By The AI Tool Bible editorial teamOpen-source AI toolsBest free tools
Writing · 36 tools
- Llama 3Free
Meta's open-weights LLM family that put serious frontier-adjacent models in everyone's hands.
Pricing: Weights free under Meta Llama Community License; inference cost via self-hosting or 3rd-party providers
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- JanFree
Open-source desktop ChatGPT alternative that runs local LLMs and routes to cloud providers from one app.
Pricing: Free and open source; bring-your-own keys for cloud models
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- LibreChatFree
Open-source, self-hostable ChatGPT-style frontend that brings every major LLM provider under one roof.
Pricing: Free and open source; self-hosted (you pay model providers for API usage)
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Apple's on-device AI layer baked into iOS, iPadOS, macOS, and visionOS with a rebuilt Siri, writing tools, and image generation.
Pricing: Free with supported Apple hardware; no subscription
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- LocalAIFree
Self-hosted OpenAI-compatible API for running LLMs, image, and audio models on your own hardware.
Pricing: Free and open source (MIT)
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- PyGPTFree
Open-source desktop AI assistant that wires every major LLM provider into one local app with agents, vision, and a code interpreter.
Pricing: Free and open-source (MIT); bring your own provider API keys
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- Meta AIFree
Meta's free consumer AI assistant powered by the Llama family of open-weight models.
Pricing: Free consumer product; no paid tier
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- STORMFree
Stanford's open-source research agent that turns a topic into a Wikipedia-style article with citations.
Pricing: Hosted demo free; self-host open-source (pay your own LLM/search API)
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- ChatGPT ShortcutFree
Curated, one-click prompt library covering ChatGPT, Claude, Gemini, and DeepSeek across writing, coding, and academic tasks.
Pricing: Free; open-source on GitHub
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- NoteGenFree
Open-source local-first note-taking app that uses AI to turn raw clippings into structured Markdown.
Pricing: Free and open source (GPL-3.0); bring your own model keys if you want paid LLMs
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- Qwen ChatFree
Alibaba's flagship chatbot fronting the Qwen family of open-weight LLMs, with vision, code, and image generation in one UI.
Pricing: Free with sign-in; paid API access via Alibaba Cloud DashScope
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- PPT MasterFree
Open-source AI that turns documents into natively editable PowerPoint decks with real shapes, not flattened images.
Pricing: Free, MIT-licensed; bring your own LLM API key
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- ChatBarFree
Menu-bar launcher that puts ChatGPT, Claude, Gemini, Copilot, Perplexity, Pi and Poe one keystroke away.
Pricing: Free and open-source; paid macOS App Store build for auto-updates
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- ResumeDiveFree
Free, no-signup resume grader that delivers brutally honest AI critique and ATS compatibility checks.
Pricing: Free, no signup required
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- AI Prompt GeniusFree
Open-source Chrome extension that turns your browser into a searchable, taggable prompt library for any AI chatbot.
Pricing: Free and open-source
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- AI Wedding ToastFree
Free AI speech generator for best men, maids of honor, and parents who froze at the blank page.
Pricing: Free, no credit card
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Free single-purpose web app that turns a one-line prompt into a rhyming poem.
Pricing: Free, no signup
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- Gist AIFree
ChatGPT-powered Chrome extension that summarizes articles, YouTube videos, and PDFs in one click.
Pricing: Completely free
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Free client-side grader that flags AI-sounding headlines, subheads, and CTAs.
Pricing: Free (no signup). Parent shop 1h Money Store sells adjacent paid products: LEVERAGE prompt pack EUR 19, MERIDIAN template EUR 17, bundle EUR 32.
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Open-source PWA for drafting manga storyboards (ネーム) with LLM-ready prompts and a structured OMNY data format.
Pricing: Free and open source (MIT License). No paid tiers; users bring their own LLM if they want to use the included AI prompts.
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- SillyTavernFree
Locally installed power-user frontend for chatting with LLMs, image models, and TTS backends
Pricing: Free and open source (AGPL-3.0). Users pay only for whichever backend they connect (OpenAI, Claude, local models via KoboldCpp/Ooba/Tabby, AI Horde, etc.).
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Alibaba's open-weight foundation model family covering chat, vision, image generation, translation, and safety classification.
Pricing: Open weights free; hosted API priced per-token via Alibaba Cloud DashScope
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OpenAI's flagship conversational assistant, and the default benchmark every other chatbot is measured against.
Pricing: Basic: $10 · Pro: $20 · Enterprise: Contact sales
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AI writing assistant from the team behind DeepL Translator, tuned for fluent rewrites across 19 languages.
Pricing: Free: Free · Pro: €20
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AI paraphrasing and grammar suite that grew into an all-in-one writing toolkit.
Pricing: Free: €0 · Premium: €8,33 · Team Plan: ?
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Budget AI writing assistant covering 40+ short-form copy use cases with a usable free tier.
Pricing: Free: $0/m · Unlimited: $7.50/m · Premium: $24.16/m
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Chrome extension that adds Gmail-style AI autocomplete to virtually any text field in the browser.
Pricing: Premium: $9.99/mo · Ultimate: $29.99/mo
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Multi-model AI add-on that turns Google Sheets and Docs into a bulk text-processing engine.
Pricing: Starter: €3.40 EUR · Standard: €6.80 EUR · Plus: €10.55 EUR · Enterprise: Contact sales
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Veteran web-based summarizer that condenses articles, books, and YouTube videos into digestible bullet points.
Pricing: Free (10 summaries); Essential $7/mo yearly; Advanced $13/mo yearly
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Zhipu AI's free chat interface powered by the GLM family of large language models.
Pricing: Free chat tier; paid API and Pro plans via z.ai open platform
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Community marketplace for AI character roleplay scenarios and prompt templates.
Pricing: Free browsing; in-app wallet/credits for premium chats
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AI writing assistant built specifically for students and academic researchers.
Pricing: Free tools; Pro $11/mo, Ultra $18/mo (annual); $499 lifetime
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Conversational roleplay platform with millions of user-created AI personas.
Pricing: Free tier; c.ai+ around $9.99/mo
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Run local LLMs directly inside Microsoft Word without sending text to the cloud.
Pricing: Free: Free · Monthly: ? · Lifetime: ?
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Budget AI copywriting workspace with 45+ templates for blogs, ads, and ecommerce listings.
Pricing: Free 100-copy trial; Pro $10/mo or $100/yr
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AI rewriting and paraphrasing assistant from AI21 Labs that polishes tone, summarizes long content, and drafts in your voice.
Pricing: Basic: $10 · Pro: $20 · Enterprise: Contact sales
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Coding · 38 tools
- AiderFree
Terminal-based AI pair programmer that writes commits.
Pricing: Free / open-source; you pay the underlying LLM API costs
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- PyCaretFree
Low-code Python AutoML library that wraps scikit-learn, XGBoost, LightGBM and friends behind a few-line API.
Pricing: Free and open-source (MIT license)
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- RepomixFree
Packs an entire codebase into a single AI-friendly file so LLMs can actually read your repo.
Pricing: Free and open source (MIT)
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- ContinueFree
Open-source, self-hostable VS Code/JetBrains AI assistant.
Pricing: Free / open-source; you pay model costs
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- DVCFree
Git-style version control for datasets, ML models, and experiment pipelines.
Pricing: Free and open source; lakeFS Enterprise available for large-scale deployments
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- RAPIDSFree
NVIDIA's open-source suite of GPU-accelerated drop-in replacements for pandas, scikit-learn, and NetworkX.
Pricing: Free and open source
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- oMLXFree
Native macOS LLM inference server built on MLX, with paged SSD KV caching for Apple Silicon agents.
Pricing: Free, Apache 2.0 open source
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- omp (Oh My Pi)Free
Open-source terminal coding agent with LSP, DAP, subagents, and a native Rust execution engine.
Pricing: MIT open source; bring your own LLM API key
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- AI SDKFree
Vercel's open-source TypeScript framework for building AI apps across 16+ providers with unified streaming, tools, and UI hooks.
Pricing: Open source (Apache 2.0); pay only for the underlying model APIs
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- HTML AnythingFree
Agentic HTML editor that turns markdown, CSV, and JSON into ship-ready posts for WeChat, X, Zhihu, and Xiaohongshu.
Pricing: Free, open-source (Apache-2.0); bring-your-own coding agent
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- LLM by DatasetteFree
A CLI and Python library for running prompts against any LLM provider and logging everything to SQLite.
Pricing: Free and open source (Apache 2.0); pay underlying model providers separately
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- RecommendersFree
Open-source Python library with classical and deep-learning algorithms for building recommendation systems.
Pricing: Free and open-source (MIT License)
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- Apache MahoutFree
Open-source ML framework pivoting toward scalable quantum computing primitives.
Pricing: Free, Apache-2.0 licensed
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- FramelinkFree
Open-source MCP server that pipes Figma designs into AI coding agents as structured, low-noise context.
Pricing: Free and open source; paid tier on waitlist
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- LMQLFree
A query language for LLMs that bolts types, templates, and constraints onto prompting.
Pricing: Free and open source (Apache-style); self-host or use with your own model API keys
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- GitHub Spec KitFree
Open-source toolkit that forces AI coding agents through a Spec to Plan to Tasks to Implement workflow.
Pricing: Free and open-source (MIT)
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- GitingestFree
Turns any Git repo into a single LLM-ready text digest by swapping 'hub' for 'ingest' in the URL.
Pricing: Free hosted service; open-source self-host
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- PonytailFree
Opinionated ruleset that forces AI coding agents to write less code by reusing what already exists.
Pricing: Free, MIT-licensed
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- Price Per TokenFree
Daily-updated LLM API pricing comparison across 300+ models, with calculators, leaderboards, and a free MCP server.
Pricing: Free; ad-supported, no signup
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- TPOTFree
Open-source AutoML library that evolves scikit-learn pipelines with genetic programming.
Pricing: Free, open source (LGPL-3.0)
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- ReasonixFree
DeepSeek-native terminal coding agent built around byte-stable prefix caching for cheap long sessions.
Pricing: MIT-licensed; BYO DeepSeek API key (pay DeepSeek directly)
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- Taste SkillFree
Open-source design-taste framework that stops AI coding agents from shipping generic, templated UIs.
Pricing: Free and open source
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Open-source Next.js chatbot template built on the Vercel AI SDK
Pricing: Free and open-source (MIT-style). Users cover their own hosting costs (e.g. Vercel plan) and AI provider API usage.
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Render LLM-emitted A2UI as real Material UI components, with streaming, two-way binding, and charts.
Pricing: Free, MIT-licensed npm package. No paid tiers; you pay only for whatever LLM you wire it to (e.g. Gemini, OpenAI, Anthropic).
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- GitRoastFree
Brutal AI-generated roasts of GitHub developer profiles
Pricing: Free to use; hobby project hosted on Vercel with no visible paid tier.
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- OpenClaudeFree
Open-source, model-agnostic terminal coding agent
Pricing: Free and open source; you pay only for whichever underlying model API you configure (or $0 with local Ollama / LM Studio).
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- OpenSpecFree
A lightweight spec-driven framework for AI coding agents
Pricing: Free and open source (MIT license). No paid tiers — install via npm.
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- OpenUIFree
Describe a UI in natural language and see it rendered live in HTML, React, Svelte, or Web Components
Pricing: Free and open-source (Apache-2.0). Hosted demo at openui.fly.dev is free; self-hosting is free but you pay for whatever model API keys (OpenAI, Anthropic, Groq, Gemini, Cohere, Mistral) you plug in, or run local models via Ollama at zero token cost.
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- PinpointFree
Visual feedback for AI coding agents
Pricing: Free and open source under the MIT license.
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- spaCyFree
Industrial-strength natural language processing in Python.
Pricing: Free and open source (MIT license). Commercial support and consulting available separately via Explosion AI.
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- VestigeFree
AI diff review for VS Code — see what an AI change actually touches before you merge it
Pricing: Free (v0.1.0 on the VS Code Marketplace)
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A high-performance, multiplayer code editor built in Rust with native AI agent workflows.
Pricing: Personal: $0 · Pro: $10 · Business: $30
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- CodeiumFree tier
Free, fast AI autocomplete + chat across 70+ editors.
Pricing: Free; Pro $15/mo; Teams $35/mo
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Browser-based playground and API console for prototyping with Google's Gemini models.
Pricing: Free tier with rate limits; paid via Gemini API usage-based pricing
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Serverless GPU infrastructure for AI workloads with sub-second cold starts and bring-your-own-cloud support.
Pricing: $30 free credit refreshed monthly; usage-based beyond that
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Open-source AI testing platform that records real API traffic and replays it as regression tests in CI.
Pricing: Free playground (30 suites, 5 AI credits/mo); Pro $24/user/mo; Enterprise custom
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Custom-silicon LPU inference platform serving open models at GPU-trouncing latency via an OpenAI-compatible API.
Pricing: Free API key with rate limits; per-token paid tiers; enterprise contracts
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AI answer engine for developers that cites sources and writes working code.
Pricing: Basic: $10 · Pro: $20 · Enterprise: Contact sales
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Image Generation · 10 tools
- Stable DiffusionFree
Open-source image generation — run anywhere, fine-tune anything.
Pricing: Free open weights; optional Stability API
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Microsoft's free text-to-image generator built into Bing, with daily boost credits and mobile video.
Pricing: Free; 10 fast generations/day, unlimited slow queue, extra boosts via Microsoft Rewards
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- MMagicFree
OpenMMLab's research-grade toolbox for image and video generation, restoration, and editing.
Pricing: Free and open source (Apache 2.0)
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Crowdsourced, volunteer-run cluster for free Stable Diffusion image and LLM text generation.
Pricing: Free; optional Kudos earned by donating GPU time or purchased via Patreon
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- SVGStud.ioFree
AI text-to-SVG generator and semantic vector search over a 127K-asset library.
Pricing: Free during preview; daily generation cap per user
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Free browser-based watermark eraser that inpaints brushed-over regions in photos.
Pricing: Free, no signup required
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The de facto local Stable Diffusion power-user UI.
Pricing: Free / open-source (AGPL-3.0). You provide your own compute (local GPU, rented cloud GPU, or a Colab instance).
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Community hub for Stable Diffusion models, LoRAs, and AI-generated imagery with on-platform generation.
Pricing: Bronze: $10 · Silver: $25 · Gold: $50
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Image generation that treats pictures as editable code, not one-shot diffusion outputs.
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Open-source 17B image model with frontier quality, hosted on Vivago and free to self-host under MIT.
Pricing: Free tier on vivago.ai; Basic $9.90/mo, Plus $29.90/mo, Pro $69.90/mo (monthly). Annual saves up to 50% (Basic $7.90/mo, Plus $19.90/mo, Pro $59.90/mo). Third-party API pricing (e.g. Fal): ~$1 per 20 Full runs, ~$1 per 33 Dev runs, ~$1 per 100 Fast runs.
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Video · 10 tools
- HyperFramesFree
Open-source video composition framework that lets AI agents build videos by writing HTML, CSS, and JS.
Pricing: Free, open-source (Apache 2.0)
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- CogVideoXFree
Open-source text-to-video and image-to-video diffusion transformer from Zhipu AI, runnable on consumer GPUs.
Pricing: Open-source weights; commercial API via bigmodel.cn
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- FaceFusionFree
Industry-leading open-source face manipulation platform for images and video
Pricing: Free and open source (OpenRAIL-AS license). No paid tiers; users bear their own GPU/compute costs when self-hosting.
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Turn a single topic or keyword into a finished HD short video, end-to-end.
Pricing: Free and open-source (MIT license). You pay only for the third-party LLM API keys, TTS providers or stock-footage APIs you choose to plug in; running with local Ollama models and Edge TTS keeps the pipeline at $0.
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- OpenMontageFree
Open-source, agentic video production studio that plugs into your AI coding assistant.
Pricing: Free and open-source (AGPL-3.0). Runs at $0 with free providers (Piper TTS, Remotion, Archive.org/NASA/Wikimedia footage). Optional paid provider costs typically run $0.15-$3 per video when using Kling, Runway Gen-4, Veo 3, ElevenLabs, Suno, FLUX, etc. Configurable budget cap defaults to $10 per run.
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Open-source text-to-video model (Mochi 1) with a hosted playground for turning prompts into short clips.
Pricing: Free: $0/month · Lite: Loading... · Standard: Loading...
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MiniMax's text-and-image-to-video generator known for fluid motion and cinematic camera work.
Pricing: Basic: $10 · Pro: $20 · Enterprise: Contact sales
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Hollywood-grade post-production suite with a Neural Engine that quietly automates the tedious parts of editing, color, and audio.
Pricing: Free Version: Free · DaVinci Resolve Studio: $295
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Multi-model AI playground for image, video, and voice generation with a generous free tier.
Pricing: 300 Credits: $10 · 900 Credits: $29 · 1,600 Credits: $50 · 3,300 Credits: $99 · 10,000 Credits: $299
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AI-native video, image, audio and design tooling built into a consumer-scale editor
Pricing: Free tier / CapCut Pro approx. $7.99 per month or $89.99 per year (regional variation) / Enterprise & team pricing on request
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Audio · 16 tools
- WhisperFree
OpenAI's open-source speech-to-text — the de-facto baseline.
Pricing: Free open weights; $0.006/min via OpenAI API
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- AudioCraftFree
Meta's open-source research toolkit for generating music and sound effects from text via a single autoregressive language model.
Pricing: Free and open source; self-hosted
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- SesameFree
Conversational voice AI aiming to cross the uncanny valley with context-aware, emotionally aware speech.
Pricing: Free research preview; consumer product pricing not announced
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- VoiceboxFree
Open-source desktop voice studio for local cloning, dictation, and giving MCP agents a voice.
Pricing: Free and open source; optional $VOICEBOX token donations
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- DiaFree
Open-weights 1.6B text-to-dialogue model that generates ultra-realistic multi-speaker conversations in one pass.
Pricing: Free, open weights (Apache 2.0); hosted larger version waitlisted
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- VibeFree
Offline desktop transcription app powered by Whisper, with diarization, batch processing, and an HTTP API.
Pricing: Free and open-source (MIT)
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- MockingBirdFree
Open-source Mandarin-first voice cloning that mimics a speaker from a 5-second sample.
Pricing: Free, open source (MIT)
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- HarmonaiFree
Open-source generative audio lab from Stability AI building diffusion models for music production.
Pricing: Free open-source models and code; no hosted product on this site
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- Kyutai MoshiFree
Open-source, full-duplex speech-to-speech foundation model with sub-200ms latency
Pricing: Free and open source. Models under CC-BY 4.0, code under MIT (Python) / Apache 2.0 (Rust). Self-hosted only — you pay your own compute (24GB+ GPU for PyTorch, or Apple Silicon via MLX).
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- so-vits-svcFree
SoftVC VITS Singing Voice Conversion — open-source pipeline for training and running singing-voice models.
Pricing: Free / open-source (AGPL-3.0). You provide your own compute (typically a CUDA-capable GPU) and training datasets.
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- AssemblyAIFree tier
Speech-to-text API with diarisation, summarisation, and topic detection.
Pricing: Pre-recorded Speech-to-Text API: $0.21 /hr · Universal-2: $0.15 /hr · Realtime Speech-to-Text API: $0.45 /hr · Universal-Streaming: $0.15 /hr · Universal-Streaming Multilingual: $0.15 /hr
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Generative AI music maker that lets anyone produce a song in under a minute and push it to Spotify.
Pricing: Free: $0.00 · Recommended: $14.99 · Pro: $39.99
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Production-grade speech-to-text, text-to-speech, and voice-agent APIs for real-time and batch audio.
Pricing: Free credits on signup; usage-based pricing; enterprise contracts available
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- MurfFree tier
TTS aimed at corporate voiceover and e-learning.
Pricing: Free preview; from $19/mo Creator; $66/mo Business
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Browser-based song generator that wraps multiple open music models behind a single freemium UI.
Pricing: Free: $0 · Basic: $14.99 · Standard: $29.99 · Pro: $59.99
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AI meeting notetaker that transcribes calls, summarizes them, and pulls out action items in real time.
Pricing: Basic: $20 · Pro: $50 · Enterprise: Contact sales
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Agents · 84 tools
- Claude Agent SDKFree
Anthropic's official SDK for building autonomous Claude agents.
Pricing: Free SDK; API usage billed at Claude rates
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- Semantic KernelFree
Microsoft's open-source SDK for wiring LLMs, plugins, and agents into enterprise .NET, Python, and Java apps.
Pricing: Free, MIT-licensed SDK; you pay for the underlying model APIs
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- CAMEL-AIFree
Open-source Python framework for building multi-agent systems and synthetic data pipelines.
Pricing: Free, open-source; pay for the underlying LLM API calls
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- RivetFree
Open-source visual IDE for building and debugging LLM agent graphs.
Pricing: Free and open source (MIT)
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- LimitlessFree
AI wearable pendant that records and transcribes your conversations into a searchable personal memory.
Pricing: Free for existing customers post-Meta acquisition; no longer sold to new buyers
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- AutoGPTFree
Open-source platform for building autonomous AI agents.
Pricing: Free / open-source; hosted platform paid
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- HeadroomFree
Open-source context compression layer that strips 70-95% of boilerplate before it hits your LLM.
Pricing: Apache 2.0 open source; free for commercial use
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Open standard that lets AI apps plug into data sources, tools, and workflows like USB-C for LLMs.
Pricing: Free and open source (MIT)
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- OpenAI SwarmFree
Lightweight multi-agent orchestration in Python.
Pricing: Free / open-source
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- OpenCLIFree
Open-source bridge that hands your already-logged-in Chrome session to a CLI and AI agents.
Pricing: Free and open-source (Apache-2.0)
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- Agent LightningFree
Microsoft's open-source trainer that fine-tunes AI agents with RL and prompt optimization, framework-agnostic.
Pricing: Free, MIT-licensed open source
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- AgentMemoryFree
Open-source persistent memory runtime for AI coding agents, with hybrid retrieval and zero external dependencies.
Pricing: Free, open-source (Apache 2.0); bring your own LLM API key
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- AstrBotFree
Open-source agentic AI assistant that bridges chat platforms like Telegram, Discord, and QQ with any LLM and a 1000+ plugin ecosystem.
Pricing: Free, open-source (AGPL-3.0); self-hosted, you pay your own LLM API costs.
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- GorillaFree
Open-source LLM purpose-built for function calling and API invocation across thousands of tools.
Pricing: Free and Apache 2.0; self-hosted
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Claude Code / Codex agent skill that generates single-file HTML slide decks in editorial-magazine or Swiss-design styles.
Pricing: Free, AGPL-3.0; requires a host AI agent (Claude Code, Codex, etc.)
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- KubeflowFree
Open-source toolkit for running the full ML lifecycle on Kubernetes.
Pricing: Free and open source; commercial distributions and managed offerings priced separately by vendors
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- ChainlitFree
Open-source Python framework for building production-grade conversational AI interfaces in minutes.
Pricing: Open-source (Apache 2.0); optional paid Literal AI observability tier
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- Cherry StudioFree
Open-source desktop AI client that wires 300+ LLMs into one chat, knowledge-base, and agent workspace.
Pricing: Free and open source; bring your own API keys
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- Coze StudioFree
Self-hostable visual AI agent development platform from ByteDance with workflows, RAG, and plugin tooling.
Pricing: Free, Apache 2.0; self-hosted
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- DeerFlowFree
Open-source multi-agent framework from ByteDance for long-running research, coding, and content tasks.
Pricing: Free, MIT-licensed (self-hosted; you pay only for LLM tokens)
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- GeniusriseFree
Open-source framework for building, deploying, and scaling AI microservices across text, vision, and audio.
Pricing: Free, open source; self-hosted
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- Hermes OneFree
Open-source desktop AI agent with a self-improving learning loop and multi-platform messaging connectors.
Pricing: Free, MIT-licensed; you pay your own model inference costs
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Open-source MCP server that wires AI agents and IDEs straight into 50+ production databases with auth, pooling, and observability baked in.
Pricing: Free and open source (Apache 2.0); self-hosted
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- mini-SWE-agentFree
A 100-line open-source coding agent that scores 74%+ on SWE-bench Verified.
Pricing: Free and open source (Apache 2.0); you pay only for the underlying LLM tokens.
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- NexentFree
Open-source, zero-code platform for spinning up production-grade AI agents from a single natural-language prompt.
Pricing: Free, open-source (MIT); self-hosted infra + model API costs apply
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Minimal open-source deep-research agent that iteratively searches, scrapes, and reasons to produce cited markdown reports.
Pricing: Free (MIT); bring your own Firecrawl + LLM API keys
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- PlanoFree
Envoy-based data plane for AI agents that handles routing, guardrails, and observability outside your app code.
Pricing: Open source; commercial pricing not disclosed
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Local long-term memory for AI agents using layered storage and Mermaid-based symbolic compression.
Pricing: MIT-licensed, self-hosted
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- A2A ProtocolFree
Open standard for letting AI agents from different frameworks talk to each other.
Pricing: Free and open source (Apache 2.0)
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- ElizaOSFree
Open-source agentic OS for building and orchestrating multi-agent swarms across Discord, Telegram, X, and onchain.
Pricing: Free, open-source (self-hosted); bring your own model API keys
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- iiiFree
Self-hosted distributed runtime for multi-language workers and AI agents under one protocol.
Pricing: Open-source; commercial pricing not published
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- Oh My OpenAgentFree
Open-source multi-agent orchestration framework that coordinates specialized AI coders across planning, execution, and verification.
Pricing: Free, open-source (SUL-1.0); bring your own model API keys
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- OpenClawFree
Open-source local AI agent that controls your computer and talks back through your messaging apps.
Pricing: Open source; you pay for the underlying LLM API usage
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- PageAgentFree
An in-page JavaScript GUI agent that drives web interfaces with natural language, no headless browser required.
Pricing: Free, MIT-licensed; LLM costs are whatever provider you wire in
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- AgenticSeekFree
Open-source local-first AI agent that browses the web, writes code, and runs tasks without sending anything to the cloud.
Pricing: Free and open source; optional SerpApi key for enhanced search
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- ArchonFree
Open-source orchestration layer for running multiple AI coding agents in parallel git worktrees.
Pricing: Free and open source; bring your own model API keys
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- ChatLabFree
Local-first analytics and AI agent for your personal chat history, with bring-your-own model support.
Pricing: Free / open-source; bring-your-own AI model
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Open-source MCP bridge that lets Cursor and Claude Code read and edit Figma files directly from the editor.
Pricing: Free, open-source (MIT)
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- OpenSandboxFree
Open-source sandbox infrastructure for running AI-generated code, agents, and browsers in isolated Docker or Kubernetes environments.
Pricing: Open source (Apache 2.0); managed pricing not disclosed
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- SWE-agentFree
Open-source autonomous agent framework that lets LLMs fix GitHub issues and find security vulnerabilities by using a custom agent-computer interface.
Pricing: Free and open-source; you pay your own LLM API costs
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- Agent SkillsFree
Open format for packaging procedural knowledge and workflows that AI coding agents load on demand.
Pricing: Free open standard
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Gradio web UI for running browser-use AI agents in a real or persistent Chrome session.
Pricing: Free, open-source; bring your own LLM API keys
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- ChassisFree
Open-source tool that auto-packages ML models into production-ready Docker containers with a prediction API.
Pricing: Free, open source (Apache-style community project)
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- MineContextFree
Open-source desktop agent that watches your screen and proactively surfaces summaries, todos, and notes.
Pricing: Free and open-source (Apache 2.0); bring your own model API keys
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- MoltbookFree
A social network where AI agents post, comment, and vote — humans verify ownership via X.
Pricing: Free during early access; no public pricing
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- RiffoFree
AI desktop file organizer that bulk-renames messy filenames and auto-sorts files into folders.
Pricing: Free download; no published paid tier
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- TaranifyFree
Mood-based entertainment recommender that picks your movies, music, and books from a 30-second color quiz.
Pricing: 100% free, unlimited recommendations
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- MCP RegistryFree
Official discovery registry for Model Context Protocol servers, with a browsable UI and a public API.
Pricing: Free and open source
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- WebChatGPTFree
Browser extension that grafts live web search results onto ChatGPT (and Claude, Gemini) prompts.
Pricing: Free
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A multi-model AI coaching layer that helps retail investors pick a philosophy and turn any chatbot into an investing assistant.
Pricing: Free (browser-based; no account required)
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- AionUiFree
Open-source desktop cowork app that unifies 20+ AI coding agents and CLI models in a single graphical workspace.
Pricing: Free and open-source under Apache-2.0. You bring your own API keys (Gemini, Claude, OpenAI, Qwen, DeepSeek, etc.) and pay each provider directly, or run local models via Ollama or LM Studio at zero token cost.
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- ApprovingFree
Visual orchestration for coding agents with human approval gates and sandboxed execution
Pricing: Free / MIT-licensed open source. Self-hosted; infrastructure costs (Docker host, agent API tokens) are on you.
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- AutoGenFree
Microsoft's open-source framework for multi-agent AI applications
Pricing: Free and open-source (MIT/CC-BY-4.0). You pay only for the underlying model providers (OpenAI, Azure OpenAI, Anthropic, local models, etc.) you plug into it.
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- CowAgentFree
Open-source, self-hosted AI agent framework that plans, uses tools, and executes multi-step tasks.
Pricing: Free and open source under MIT License; users bring their own model API keys (e.g. OpenAI, Anthropic, DeepSeek) and pay those providers directly.
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- FabricFree
An open-source framework for augmenting humans with AI, one composable prompt at a time.
Pricing: Free and open-source (MIT). Users bring their own API keys and pay each LLM provider directly; local models via Ollama or LM Studio incur no per-token cost.
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Project-aware MCP server that gives AI coding agents structured, guarded access to GameMaker Studio projects.
Pricing: Free and open source (MIT license). Install via npm/npx.
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50+ Jupyter tutorials for building GenAI agents, from a simple chatbot to multi-agent systems.
Pricing: Free and open source (Jupyter notebooks). Author sells an optional paid course at diamant-ai.com and runs a free newsletter; the repository itself has no paywall.
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- Go MicroFree
Agent harness and microservice framework, in one Go runtime.
Pricing: Open source (Apache 2.0). Commercial support available separately; hosted model access via Atlas Cloud is billed by that provider.
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Google's open-source framework for building, evaluating, and deploying production AI agents
Pricing: Framework itself is free and open-source (Apache 2.0). Costs come from the underlying model provider (e.g. Gemini API / Vertex AI usage) and any hosting infrastructure (Cloud Run, GKE, Agent Engine).
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- GooseFree
Open-source, local-first AI agent for code, workflows, and everything in between.
Pricing: Free and open source under Apache 2.0. You bring your own model API keys (or run local models via Ollama); provider costs are pass-through.
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- gpt-engineerFree
Describe software in natural language, watch an AI agent write, run, and improve it.
Pricing: Free and open source under MIT license. Users pay only for the underlying LLM API calls (OpenAI, Anthropic, Azure OpenAI) or run local models at zero token cost.
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- GPT PilotFree
Open-source multi-agent 'AI developer' that builds apps step by step with human checkpoints
Pricing: Free / open source (MIT). Users supply their own LLM API keys (OpenAI, Anthropic, Groq, Azure, or OpenRouter), so real cost depends on token usage on the chosen provider.
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- GPT ResearcherFree
Open-source autonomous deep-research agent with cited long-form reports
Pricing: Free and open-source (MIT License). Costs come only from your chosen LLM provider (OpenAI, Anthropic, Google, etc.) and retriever (Tavily, Bing, SerpAPI, DuckDuckGo is free).
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- HydraFree
Local-first trust control plane that routes AI tasks to the cheapest model that clears your confidence bar.
Pricing: Free and open-source under the MIT license; no hosted tier or paid plan. You still pay whatever the underlying providers (Anthropic, OpenAI, OpenRouter, etc.) charge for tokens Hydra dispatches to them.
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Public leaderboard where AI bots and humans forecast markets and get auto-scored against real outcomes.
Pricing: Free to play. Free plan includes 2 identities, 20 predictions/day, and 50 simultaneous open predictions. No paid tier advertised.
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- MemPalaceFree
Open-source, local-first AI memory system for LLM agents
Pricing: Free and open-source under the MIT license. No paid tiers; self-hosted with zero API costs once installed.
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A lightweight Python framework for building multi-agent LLM applications with handoffs, guardrails, and built-in tracing.
Pricing: SDK is free and open source (MIT-licensed). Cost is pass-through to whichever model provider you point it at — OpenAI API pricing applies when using GPT models; third-party providers billed separately.
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- ScraplingFree
Adaptive Python web-scraping framework with a built-in MCP server for AI coding agents.
Pricing: Free and open source under BSD-3-Clause. Self-hosted Python library with no paid tier or hosted service; users pay only for their own infrastructure, browsers, and any proxies or LLM tokens they choose to plug in.
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- The Email GameFree
An arena for autonomous email agents.
Pricing: Free to enter. Prize pool of $1,700 total ($1,000 first place, $500 second, $200 third). Referral bonus of $15 per referred competitor up to $45.
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- ViglaFree
Open-source mission control for AI coding agents
Pricing: Free and open source under Apache-2.0. No paid tiers; users build from source.
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- YAFLFree
Agent-first, end-to-end-encrypted file transfer over one MCP call or CLI command.
Pricing: Free to use; the schema.org offer on the homepage lists price 0 USD. No paid tiers advertised at time of review.
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- ZeroClawFree
Private, local-first AI assistant that connects to Telegram, Discord and WhatsApp
Pricing: Free and open source. You supply your own hardware and (optionally) your own LLM API keys.
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Secure, isolated sandboxes for running AI-generated code with sub-90ms cold starts.
Pricing: Pay-per-second from $0.000014/sec; $200 free credit
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Open-source visual builder for LangChain-style AI agents and RAG pipelines.
Pricing: Open-source free; hosted free tier + paid enterprise via DataStax
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Open-source Python framework for building multi-agent systems, paired with a production runtime that ships in your own cloud.
Pricing: Free: Free · Pro: $150/mo · Enterprise: ?
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Open-source conversational AI platform for building multi-channel support agents and automation workflows.
Pricing: 14-day free trial; freemium, paid, and enterprise tiers
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Browser extension that pipes YouTube transcripts, articles, and PDFs into ChatGPT, Claude, Gemini, or Mistral for instant summaries.
Pricing: Basic: $10 · Pro: $20 · Enterprise: Contact sales
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- MindsHub CoworkFree tier
Unified workspace for open-source AI agents that turn tasks into shareable documents, dashboards, and apps.
Pricing: Free: $0 · Pro: Pay as you go
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Browser-based autonomous AI agent builder that chains GPT calls toward a goal you define.
Pricing: Free tier with limited monthly runs; paid plans for higher usage
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Chrome extension that surfaces YouTube transcripts and AI-generated video summaries alongside one-click access to ChatGPT.
Pricing: Basic: $20 · Pro: $50 · Enterprise: Contact sales
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Human-in-the-loop review layer for AI agents and automated workflows.
Pricing: Free: $0 · Team: $99 · Growth: $350 · Business: $950
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An AI-native browser from The Browser Company that turns tabs into an agentic assistant for knowledge workers.
Pricing: Free consumer download; paid Dia for Work tier with SSO and admin controls (price not disclosed publicly).
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Secure cloud sandboxes for running AI-generated code
Pricing: Hobby: Free · Pro: $150 · Ultimate: Contact us for custom solution with special pricing · Enterprise: Contact us for custom solution with special pricing
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Real-time infrastructure observability with embedded AI anomaly detection and an AI co-engineer for root-cause analysis.
Pricing: Community: Free · Business: $4.50 /node/month · Enterprise: Contact sales
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RAG · 28 tools
- QuivrFree
Open-source RAG framework for building custom AI assistants over your own documents in a few lines of Python.
Pricing: Open source (pip install quivr-core); pay only for LLM/vector-store usage
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- FeastFree
Open-source feature store that serves consistent features to ML training and online inference, with RAG vector search built in.
Pricing: Free, open source (Apache 2.0); self-hosted
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Self-hostable RAG and agent framework that wires LangChain to any local open-source LLM and a knowledge base.
Pricing: Apache-2.0 open source; self-hosted, infra costs only
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- OneKEFree
Open-source multi-agent framework for schema-guided knowledge extraction from documents.
Pricing: Free, MIT-licensed; you pay for LLM API calls or self-hosted compute
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- WeKnoraFree
Tencent's open-source RAG framework that turns raw documents into a queryable knowledge base, ReAct agent, and self-maintaining wiki.
Pricing: Free, open-source (self-hosted)
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Open-source embedding and reranker models from BAAI that anchor a huge share of production RAG stacks.
Pricing: Free, open-source (MIT-style license); self-hosted inference cost only
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- LangExtractFree
Google's open-source Python library for LLM-driven structured extraction from unstructured text, with source-grounded outputs.
Pricing: Library is free (Apache-2.0); LLM API costs depend on chosen backend
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- UltraRAGFree
Low-code, YAML-driven RAG pipeline orchestrator with a visual UI for building and demoing retrieval systems.
Pricing: Open source; self-hosted
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- alphaXivFree
AI reading layer over arXiv with grounded Q&A, auto-summaries, and line-by-line discussion on every preprint.
Pricing: Free, no signup required
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- GraphifyFree
Open-source on-device knowledge graph engine that turns code, docs, papers, meetings and images into a queryable graph.
Pricing: MIT-licensed, free forever; cloud tier hinted but unpriced (waitlist)
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- KotaemonFree
Open-source RAG UI for chatting with your own documents, locally or self-hosted.
Pricing: Free, open-source (MIT-style); self-hosted infrastructure costs only
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Open-source Streamlit app that builds a custom RAG pipeline from a natural-language brief.
Pricing: Free, MIT-licensed; bring your own model/API keys
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- CocoIndexFree
Open-source incremental data framework that keeps RAG indexes and agent context continuously fresh.
Pricing: Open-source, self-hosted; bring your own infra
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- DeepSearcherFree
Open-source agentic RAG framework for private enterprise data, built by the Zilliz/Milvus team.
Pricing: Free, Apache 2.0; bring your own LLM and vector DB costs
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- TurboVecFree
Rust-powered vector index with 2-4 bit TurboQuant compression for SIMD-accelerated RAG search.
Pricing: Free, MIT licensed
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- YuxiFree
Open-source AI agent platform that fuses agentic RAG with knowledge graphs on a LangGraph runtime.
Pricing: Free, MIT-licensed self-host
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- AI Anime FinderFree
Vibe-based semantic search over the AniList catalogue with watch-time and shareable taste cards.
Pricing: Free. No account, no sign-up, no per-query limits advertised.
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- DoclingFree
Open-source document parsing for AI: PDFs, Office files, audio and video into clean, structured Markdown/JSON
Pricing: Free and open source under MIT License. Hosted by the LF AI & Data Foundation; no paid tiers.
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- SetokuFree
Open-source MCP knowledge server that makes any AI fluent in your company data
Pricing: Free / open-source (Apache-2.0). Self-hosting cost only: ~$5-12/mo VPS. No SaaS tier and no per-token inference charges from Setoku itself.
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Serverless vector and document database for production RAG and AI agents
Pricing: Small On-Demand: Contact sales · Medium (Balanced): Contact sales · Medium (Storage Optimized): Contact sales · Large (Balanced): Contact sales · Large (Storage Optimized): Contact sales
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Vector search built into the operational database you're already using.
Pricing: Free: $0 · Flex: Up to $30 · Dedicated: Starts at $56.94
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Google's source-grounded research notebook that turns your documents into chats, briefs, and AI-hosted podcasts.
Pricing: Free tier; Plus via Google One AI Premium ($19.99/mo) or Workspace add-on
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AI-assisted systematic review platform for screening, deduplicating, and extracting data from large literature corpora.
Pricing: Free forever for basic use; enterprise custom pricing
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AI-curated arXiv discovery layer that summarizes frontier papers and aggregates social discussion around them.
Pricing: Basic: $0 · Pro: $12 /month · Max: $30 /month
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Conversational answer engine that cites its sources by default.
Pricing: Basic: $10 · Pro: $30 · Enterprise: Contact sales
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AI reading companion that decodes dense academic papers by highlighting and chatting with the PDF.
Pricing: Free: $0/month · Pro: $16/month · Teams: Contact us
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Open-source Firebase alternative built on Postgres with a first-class pgvector AI toolkit.
Pricing: Free: $0 · Pro: $25 · Team: $599 · Enterprise: Custom
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One secure API for real-time web access for AI agents
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Fine-tuning · 14 tools
- vLLMFree
Open-source high-throughput inference engine for serving LLMs with PagedAttention and continuous batching.
Pricing: Free and open-source (Apache 2.0); self-hosted infrastructure costs apply
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- LudwigFree
Declarative, YAML-driven deep learning framework for fine-tuning LLMs and multi-modal models without writing training loops.
Pricing: Free, Apache 2.0 open source
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- SGLangFree
Open-source high-throughput inference engine for LLMs and multimodal models with OpenAI-compatible serving.
Pricing: Free, open-source (Apache 2.0); self-hosted infra cost only
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- OptunaFree
Open-source Python framework for automated hyperparameter optimization across any ML stack.
Pricing: Free and open source (MIT)
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- Ray TuneFree
Open-source Python library for distributed hyperparameter tuning at any scale.
Pricing: Open-source (Apache 2.0); managed via Anyscale offers a $100 starting credit
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- LLaMA FactoryFree
Open-source, no-code WebUI for fine-tuning 100+ open LLMs with LoRA, QLoRA, DPO, and PPO.
Pricing: Free, open-source (Apache-2.0); self-hosted
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- H2O AutoMLFree
Open-source automated machine learning that handles feature engineering, model selection, and stacked ensembling out of the box.
Pricing: Free and open-source (Apache 2.0); paid Driverless AI sold separately
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- ONNXFree
Open standard for representing and exchanging machine learning models across frameworks and runtimes.
Pricing: Free and open source (Apache-2.0); Linux Foundation AI project
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- Apache SINGAFree
Apache-licensed distributed deep learning library focused on scalable training across GPUs and nodes.
Pricing: Free, Apache 2.0 licensed
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- AutotuneLLMFree
An open-source optimization layer that sits between your app and Ollama to squeeze more performance out of local LLMs.
Pricing: Free and open source (MIT licensed).
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- Colossal-AIFree
Making large AI models cheaper, faster, and more accessible through distributed training
Pricing: Open-source (Apache 2.0). Enterprise support, consulting, and managed training services available from HPC-AI Technology on request.
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Learn how LLMs work by building one on your Mac
Pricing: Free macOS download. No account, subscription, or fees. Mac App Store version listed as coming soon.
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The deep learning framework for professional AI researchers and ML engineers
Pricing: Free and open source (Apache 2.0). Optional paid compute available via the Lightning AI Studio platform.
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- Hugging Face AutoTrainFree tier
No-code fine-tuning and training pipeline that spins up state-of-the-art models on the Hugging Face Hub.
Pricing: Per-minute billing based on hardware tier; self-hosted OSS version is free
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Evaluation · 26 tools
- LiveBenchFree
Contamination-free LLM benchmark that refreshes its questions monthly to keep frontier models honest.
Pricing: Free and open source; self-hosted evaluation runner
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Open benchmark from UC Berkeley that ranks LLMs on real-world tool-use and function-calling accuracy.
Pricing: Free and open source; you pay only for inference when reproducing runs.
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- MLflowFree
Open-source platform for tracking, evaluating, and deploying ML models and LLM applications.
Pricing: Free and open source (Apache 2.0); managed offering via Databricks
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- OpenAI EvalsFree
OpenAI's open-source framework for benchmarking LLMs against a shared registry of evaluations.
Pricing: Free (MIT); you pay OpenAI API costs for eval runs
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- TruLensFree
Open-source evaluation and tracing framework for LLM apps and agents, built on OpenTelemetry.
Pricing: Free, open source (Apache-licensed Python package)
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- LLM StatsFree
Live leaderboard and side-by-side comparison hub for 300+ frontier LLMs across reasoning, coding, and multimodal benchmarks.
Pricing: Free to browse; underlying model usage billed by each provider
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- MathEvalFree
Holistic benchmark suite for evaluating mathematical reasoning in large language models.
Pricing: Free; open-source benchmark with leaderboard submissions via matheval.ai
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- Inspect AIFree
Open-source LLM evaluation framework from the UK AI Security Institute with 200+ built-in benchmarks.
Pricing: Free and open source (MIT-style license); you pay only for underlying model API usage.
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- LLMEvalFree
Open academic benchmark suite for stress-testing LLMs on contamination-resistant, domain-specific tasks.
Pricing: Free; open-source academic benchmarks
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- AlpacaEvalFree
Automatic LLM evaluator and leaderboard that benchmarks instruction-following with length-controlled win rates.
Pricing: Free and open-source; pay only for the underlying OpenAI annotator API calls
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- SEAL LeaderboardFree
Private, expert-graded leaderboards from Scale AI that rank frontier LLMs on domains contaminated public benchmarks can no longer measure.
Pricing: Free to view; paid custom evals via Scale enterprise sales
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- VisualWebArenaFree
Open benchmark for evaluating multimodal web agents on realistic visual browsing tasks.
Pricing: Free and open source (MIT-style research release)
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- llmfitFree
Terminal tool that scores hundreds of open LLMs against your actual CPU, RAM, and GPU and tells you which ones will run well.
Pricing: Free, MIT-licensed
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- OlympicArenaFree
Olympiad-level multi-discipline benchmark for stress-testing reasoning in LLMs and multimodal models.
Pricing: Free, open-source research benchmark
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- CompassRankFree
Public leaderboard from the OpenCompass project ranking open and closed LLMs across 100+ benchmarks.
Pricing: Free leaderboard; OpenCompass toolkit is Apache 2.0 open source
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- InfiBenchFree
Stack Overflow-derived benchmark for evaluating code LLMs on real-world programming questions.
Pricing: Free and open source (CC BY-SA 4.0)
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- MixEvalFree
Dynamic LLM benchmark that mixes web queries with existing datasets to mirror Chatbot Arena rankings at a fraction of the cost.
Pricing: Free and open source
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- Arena AIFree
Head-to-head LLM battle arena with a public leaderboard for ranking AI models.
Pricing: Free to use; no public paid tier listed
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- AI MeterFree
Local usage meter that turns AI coding-agent tokens into estimated electricity and water consumption.
Pricing: Free for individuals and companies; open source under a public GitHub repo.
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- AI World BakeoffFree
Ten AI coding models, three identical briefs, thirty explorable 3D worlds
Pricing: Free to view. No paid tiers, sign-up, or accounts.
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- Lagotto MeterFree
Measure the gap between what your site claims and what an AI agent actually finds
Pricing: Free (currently in public beta)
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Match LLMs to GPUs and plan multi-model AI stacks by VRAM, bandwidth and precision.
Pricing: Free (open web tool hosted on GitHub Pages).
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- ModelBiasFree
100 models, 100 prompts, 30,000 answers — an interactive look at AI defaults
Pricing: Free to browse and download the full dataset from GitHub.
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- NetronFree
Visualizer for neural network, deep learning, and machine learning models
Pricing: Free and open-source (MIT license). Available as a web app, desktop app (macOS/Linux/Windows), and Python package at no cost.
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- QuantProbeFree
Physics-based calculator that predicts LLM decode speed, memory fit, and quantization quality on any hardware.
Pricing: Free and open source; install with `pip install quantprobe` or use the hosted web calculator.
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No-signup LLM playground for testing, comparing, and versioning prompts against your own API keys.
Pricing: One-time lifetime ~$60-$120; 14-day money-back
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MCP Servers · 40 tools
Model Context Protocol server that gives LLMs full read/write access to your Airtable bases.
Pricing: Open source (MIT) and free to run. You still need an Airtable account and personal access token; Airtable itself is Free / Team $20 per user/mo / Business $45 per user/mo / Enterprise (custom).
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- Apple Notes MCPFree
Let Claude read your local Apple Notes over the Model Context Protocol.
Pricing: Free / open-source (MIT). No hosted service; runs locally on your Mac.
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- AWS MCP ServersFree
Official AWS Labs collection of Model Context Protocol servers for connecting AI coding assistants and agents to AWS services and documentation.
Pricing: Free and open source (Apache 2.0). AWS service usage billed at standard AWS rates. Optional AWS-hosted 'remote managed' servers included at no additional charge beyond consumed AWS services.
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- Azure MCP ServerFree
Official Microsoft MCP server that exposes 40+ Azure services to AI agents under the developer's own Entra ID credentials.
Pricing: Server is free and MIT-licensed. Azure resource usage is billed separately at standard Azure rates based on whatever services the agent queries or mutates.
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- Blender MCPFree
Give Claude hands inside Blender — an MCP server for natural-language 3D modeling.
Pricing: Free and open-source (MIT license). No hosted service, no subscription; you supply your own MCP-capable client (Claude Desktop, Cursor, VS Code, OpenCode) and pay only for whatever LLM the client uses.
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- Chroma MCPFree
Official MCP server that gives LLM clients direct access to the Chroma vector database.
Pricing: Open source (Apache 2.0). Free to run locally or self-hosted; embedding-function API keys (OpenAI, Cohere, Jina, VoyageAI, Roboflow) billed by those providers. Chroma Cloud pricing set separately by Chroma.
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MCP server that gives Claude and other LLMs DuckDuckGo web search plus URL content fetching, with no API key required.
Pricing: Free and open source (MIT). DuckDuckGo's search endpoint is used without API keys, so there are no per-query costs; self-hosting only incurs whatever compute you run it on.
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Archived MCP server that lets Claude and MCP clients generate images via EverArt's FLUX, SD 3.5 and Recraft models.
Pricing: MCP server is free and open source; requires an EverArt account and API key (EverArt itself is a paid image-generation service with credit-based pricing).
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- FastMCPFree
The fast, Pythonic way to build MCP servers, clients, and apps.
Pricing: Free and open source under Apache-2.0; no paid tier for the framework itself. Commercial hosting/scaling optionally available via Prefect Horizon.
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MCP server that feeds Figma layout, styles and components into AI coding agents like Cursor and Claude Code.
Pricing: Free and open source (MIT). Optional Framelink hosted extras are gated behind a waitlist with no published pricing.
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GitHub's official Model Context Protocol server for connecting AI agents to repositories, issues, PRs, Actions, and security data.
Pricing: Free and open source (MIT). Uses your existing GitHub account; no separate charges. GitHub API rate limits and any Copilot/Enterprise licensing you already pay for still apply.
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Read, list, and search your Google Drive from any MCP-compatible AI client.
Pricing: Free and open-source (MIT). Google Cloud/Drive API usage governed by Google's free quotas.
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- Grafana MCPFree
Official Grafana Labs MCP server — dashboards, Prometheus, Loki, alerts and incidents in your LLM client
Pricing: Free and open source (Apache 2.0). You still need a Grafana instance — OSS Grafana is free; Grafana Cloud has a free tier plus paid Pro/Advanced/Enterprise plans.
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- Hacker News MCPFree
MCP server that lets Claude and other LLM clients read Hacker News stories, comments, users, and search results
Pricing: Free and open-source (MIT). No API keys or accounts required — hits the public Hacker News API and Algolia HN Search directly.
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Open-source MCP server that lets any LLM control and observe a Home Assistant smart home in real time.
Pricing: Free and open source (Apache 2.0). Self-hosted; only cost is your own Home Assistant instance and the LLM client you connect to it.
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Open-source MCP server bridging LLM agents to Linear's issue tracker (now deprecated in favour of Linear's official remote MCP)
Pricing: Free and open source (MIT). Requires a Linear account and personal API key; Linear itself is free for small teams, $8/user/mo Standard, $14/user/mo Plus.
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- mcp-agentFree
Python framework for building composable AI agents on the Model Context Protocol
Pricing: Free and open source (Apache 2.0). LastMile AI offers an optional managed cloud/deployment tier (Beta) with usage-based pricing not publicly listed at time of writing.
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The kitchen-sink reference MCP server that exercises every corner of the Model Context Protocol
Pricing: Free and open source (MIT License). No cloud service or paid tier — you run it locally via npx, Docker, or your MCP client of choice.
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- MCP Fetch ServerFree
Official Model Context Protocol reference server that lets any MCP-compatible LLM fetch web pages and read them as clean markdown.
Pricing: Free and open source (MIT License). No hosted tier; you run it locally via uvx, pip, or Docker.
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Reference MCP server that gives Claude, Cursor, and other MCP clients scoped read/write access to your local filesystem.
Pricing: Free and open source (MIT). Self-hosted; no vendor cost.
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- MCP Git ServerFree
Reference MCP server that lets any LLM read, search, and manipulate local Git repositories.
Pricing: Free and open source (MIT License). Self-hosted; you pay only for the compute wherever you run it.
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Persistent knowledge-graph memory for Claude and other MCP clients
Pricing: Free and open source (MIT). Self-hosted; no vendor charges. Runs locally via npx or Docker.
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- MCP Python SDKFree
Official Python SDK for building Model Context Protocol servers and clients.
Pricing: Free, MIT-licensed open source.
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MCP server that lets Claude, Cursor, VS Code and other agents drive kubectl and Helm against real clusters
Pricing: Free and open source (MIT license). Kubernetes cluster and any AI client subscriptions billed separately.
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- MCP Time ServerFree
Official MCP reference server for current time and IANA timezone conversion.
Pricing: Free and open source (MIT-licensed reference server maintained by the Model Context Protocol project).
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Official TypeScript SDK for building Model Context Protocol servers and clients.
Pricing: Free and open source (Apache 2.0 for new contributions; older code MIT).
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The official Notion MCP server: give Claude, Cursor, and Copilot typed access to your Notion pages, databases, and comments.
Pricing: Server is free and MIT-licensed; a paid Notion workspace is only required for features gated behind Notion's own plans. Notion tiers: Free / Plus $10 per user/mo / Business $18 per user/mo / Enterprise (custom).
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- Obsidian MCPFree
Model Context Protocol server that lets Claude read, write, and reorganize your Obsidian vault.
Pricing: Free and open-source (MIT). No paid tiers; users only pay for their own Obsidian license if they choose Commercial/Sync/Publish add-ons.
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- Playwright MCPFree
Microsoft's official Model Context Protocol server for browser automation via Playwright.
Pricing: Free and open source (Apache-2.0). No paid tiers — you cover browser/compute costs where you run it.
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- Postgres MCP ProFree
Open-source Postgres MCP server with deterministic health checks, index tuning, and safe SQL execution.
Pricing: Free and open source (MIT license). No paid tiers.
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Reference MCP server that lets LLMs drive a real Chromium browser via Puppeteer.
Pricing: Free and open source (MIT license). No hosted service; you run it locally under Node/Docker.
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Official Qdrant MCP server that turns a vector database into a semantic memory layer for Claude, Cursor, Windsurf, and any MCP client.
Pricing: Free and open source (Apache-2.0). Qdrant itself can be self-hosted for free or used via Qdrant Cloud (free tier available, paid plans from ~$25/mo for managed clusters).
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MCP server that lets Claude and other LLM clients fetch and analyse Reddit threads
Pricing: Free and open source (MIT). No paid tier. You run it locally; Reddit's public JSON endpoints are hit unauthenticated, subject to Reddit rate limits.
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- Redis MCP ServerFree
Archived reference MCP server exposing basic Redis set/get/delete/list to any MCP-capable LLM client.
Pricing: Free and open source (MIT). Self-hosted; you supply your own Redis instance.
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Reference MCP server for structured, revisable step-by-step reasoning in any MCP host.
Pricing: Free and open-source under the MIT License. No paid tiers; install via npx or Docker at no cost.
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- Slack MCP ServerFree
Archived reference MCP server that lets Claude and other MCP clients read and post in a Slack workspace via a bot token.
Pricing: Free / open-source (MIT). Requires a Slack workspace and a Slack bot token; Slack itself is free/paid.
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- Spotify MCPFree
Model Context Protocol server that hands your LLM the Spotify Web API — playback control, search, queue and playlist management from inside Claude Desktop or any MCP client.
Pricing: Free / MIT-licensed open source. Requires a free Spotify developer app and a paid Spotify Premium subscription for playback control.
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Reference MCP server for querying and analyzing SQLite databases through Claude and other MCP clients.
Pricing: Free / open source (MIT). No usage fees; runs locally against a SQLite file you control.
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Stripe's official SDK and MCP server for wiring AI agents into payments, billing, and customer operations.
Pricing: Toolkit and MCP server are free (MIT). Underlying Stripe usage is billed at standard Stripe rates (typically 2.9% + 30 cents per successful card charge; billing/subscriptions and other products priced separately). LLM/model calls billed by your model provider.
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Model Context Protocol server that pulls YouTube subtitles into any MCP-capable LLM client.
Pricing: Free and open source (MIT). You only pay for whatever LLM sits on the other end of the MCP connection (Claude Desktop, Claude API, or any other MCP-capable client).
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