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📖 The AI Tool Bible

AI tools tagged Free Forever

48 tools matching this tag.pricing

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LA

LangGraph

Featured
Agents · BYO (Claude / GPT / open)
8.8

Stateful, graph-based agent orchestration from LangChain.

Freemium· Developer: $0 / seat · Plus: $39 / seat · Enterprise: Custom pricingstateful agentshuman-in-loop
LL

LlamaIndex

Featured
RAG · BYO (Claude / GPT / open)
8.7

Data framework for connecting LLMs to your data.

Freemium· Free open-source; LlamaCloud paidRAGdata ingestion
CR

CrewAI

Featured
Agents · BYO (Claude / GPT / open)
8.4

Python framework for multi-agent orchestration.

Freemium· Basic: Free · Enterprise: Custommulti-agentorchestration
CL

Cline

Coding · Model-agnostic: Claude (Anthropic), GPT (OpenAI), Gemini (Google), DeepSeek, Grok, Mistral, Cerebras, plus local Ollama/LM Studio
8.7

Open-source agentic coding assistant that plans, edits, and runs code inside your IDE

Freemium· ClinePass: $9.99/monthMulti-file feature scaffoldingLarge-scale refactors
CA

Claude Agent SDK

Agents · Claude Opus / Sonnet
8.6

Anthropic's official SDK for building autonomous Claude agents.

Free· Free SDK; API usage billed at Claude ratesClaude agentstool use
WH

Whisper

Audio · Whisper large-v3
8.6

OpenAI's open-source speech-to-text — the de-facto baseline.

Free· Free open weights; $0.006/min via OpenAI APItranscriptionself-hosted
DO

Doubao

Agents · Doubao Seed 2.1 Pro (in-house ByteDance), with Seed 2.0 / 1.5 on free tier
8.5

ByteDance's flagship AI assistant with a real agent mode and one of the largest user bases outside ChatGPT

Freemium· Free tier (chat, search, writing, image gen, voice/video chats) / Doubao Pro RMB 68/mo (~$9.40) / RMB 200/mo (~$27.80) / RMB 500/mo (~$69.40). API: 6 yuan per 1M input tokens, 30 yuan per 1M output tokens for Doubao 2.1 Pro (cache-hit as low as 1.2 yuan).Long-document PDF and Office file summarizationAutonomous browser and local-computer agent tasks
AI

Aider

Coding · BYO (Claude / GPT-4 / Gemini / DeepSeek)
8.4

Terminal-based AI pair programmer that writes commits.

Free· Free / open-source; you pay the underlying LLM API costsCLIgit workflow
PY

PyCaret

Coding · Multi-model (scikit-learn, XGBoost, LightGBM, CatBoost)
8.4

Low-code Python AutoML library that wraps scikit-learn, XGBoost, LightGBM and friends behind a few-line API.

Free· Free and open-source (MIT license)automlclassification
QU

Quivr

RAG · Multi-model (OpenAI, Anthropic, Mistral, Gemma)
8.4

Open-source RAG framework for building custom AI assistants over your own documents in a few lines of Python.

Free· Open source (pip install quivr-core); pay only for LLM/vector-store usagedocument-qacustom-knowledge-base
SK

Semantic Kernel

Agents · Multi-model
8.4

Microsoft's open-source SDK for wiring LLMs, plugins, and agents into enterprise .NET, Python, and Java apps.

Free· Free, MIT-licensed SDK; you pay for the underlying model APIsagent-orchestrationllm-plugins
LA

LangChain

RAG · BYO (any major LLM)
8.3

The broad LLM application framework — chains, agents, retrievers.

Freemium· Free open-source; LangSmith paidgeneral LLM appsRAG
LL

Llama

Fine-tuning · Llama 4 (Maverick, Scout), Llama 3.3/3.2/3.1
8.3

Meta's open-weight LLM family covering 1B mobile models up to 405B frontier and natively multimodal 10M-context Llama 4 variants.

Freemium· Basic: $15 · Pro: $30 · Enterprise: $100self-hosted-llmfine-tuning
L3

Llama 3

Writing · Llama 3 / 3.1 (8B, 70B, 405B)
8.3

Meta's open-weights LLM family that put serious frontier-adjacent models in everyone's hands.

Free· Weights free under Meta Llama Community License; inference cost via self-hosting or 3rd-party providerschatlong-context reasoning
LS

LM Studio

Agents · Multi-model (gpt-oss, Qwen3, Gemma, DeepSeek-R1, Llama, others)
8.3

Desktop app for discovering, downloading, and running open-weight LLMs locally with an OpenAI-compatible server.

Freemium· Free: $0local-llm-inferenceprivate-chat
VA

Vanna.ai

RAG · Multi-model (Anthropic, OpenAI, Gemini, Ollama)
8.3

Open-source text-to-SQL agent that learns your schema and writes queries against your real warehouse.

Freemium· Explorer: $50 · Team: $500 · Enterprise: Contact salestext-to-sqlnatural-language-bi
VL

vLLM

Fine-tuning · Multi-model (open-weight LLMs: Llama, Qwen, DeepSeek, Mistral, Gemma, Phi, etc.)
8.3

Open-source high-throughput inference engine for serving LLMs with PagedAttention and continuous batching.

Free· Free and open-source (Apache 2.0); self-hosted infrastructure costs applyllm-servingself-hosted-inference
AU

AudioCraft

Audio · MusicGen, AudioGen, EnCodec
8.2

Meta's open-source research toolkit for generating music and sound effects from text via a single autoregressive language model.

Free· Free and open source; self-hostedtext-to-musicsound-effects
FE

Feast

RAG
8.2

Open-source feature store that serves consistent features to ML training and online inference, with RAG vector search built in.

Free· Free, open source (Apache 2.0); self-hostedfeature-storerag-retrieval
GE

Great Expectations

Evaluation
8.2

Open-source data quality framework for validating the datasets that feed your ML and analytics pipelines.

Freemium· Developer: Free · Team: Custom · Enterprise: Contact Salesdata-validationpipeline-testing
HY

HyperFrames

Video · Multi-model (Claude Code skill; BYO agent)
8.2

Open-source video composition framework that lets AI agents build videos by writing HTML, CSS, and JS.

Free· Free, open-source (Apache 2.0)agent-driven videoprogrammatic video
JA

Jan

Writing · Multi-model (local open-weights + OpenAI/Claude/Gemini via API)
8.2

Open-source desktop ChatGPT alternative that runs local LLMs and routes to cloud providers from one app.

Free· Free and open source; bring-your-own keys for cloud modelslocal-llm-chatprivate-ai-assistant
LI

LibreChat

Writing · Multi-model (OpenAI, Anthropic, Google, AWS Bedrock, Azure, Ollama, and others)
8.2

Open-source, self-hostable ChatGPT-style frontend that brings every major LLM provider under one roof.

Free· Free and open source; self-hosted (you pay model providers for API usage)multi-model chatself-hosted chatgpt
LI

LiveBench

Evaluation · Multi-model
8.2

Contamination-free LLM benchmark that refreshes its questions monthly to keep frontier models honest.

Free· Free and open source; self-hosted evaluation runnerllm-benchmarkingmodel-selection
LU

Ludwig

Fine-tuning · Multi-model (PyTorch + HuggingFace Transformers)
8.2

Declarative, YAML-driven deep learning framework for fine-tuning LLMs and multi-modal models without writing training loops.

Free· Free, Apache 2.0 open sourcellm-fine-tuningmulti-modal-training
TR

Trae

Coding · Multi-model
8.2

ByteDance's AI-native IDE built as a Cursor-style VS Code fork with agent and cloud-task workflows.

Freemium· Lite: $3 · Pro: $10 · Pro+: $30 · Ultra: $100ai-idecode-completion
UN

Unsloth

Fine-tuning · Llama, Mistral, Gemma, Qwen, GLM (multi-model)
8.2

Open-source LLM fine-tuning toolkit with custom kernels that train 2-30x faster and use up to 90% less VRAM.

Freemium· Free open-source; Pro and Enterprise contact saleslora-finetuningqlora
AI

Apple Intelligence

Writing · Apple Foundation Models + Private Cloud Compute; optional ChatGPT
8.1

Apple's on-device AI layer baked into iOS, iPadOS, macOS, and visionOS with a rebuilt Siri, writing tools, and image generation.

Free· Free with supported Apple hardware; no subscriptionwriting-assistancesummarization
BF

Berkeley Function-Calling Leaderboard

Evaluation · Multi-model
8.1

Open benchmark from UC Berkeley that ranks LLMs on real-world tool-use and function-calling accuracy.

Free· Free and open source; you pay only for inference when reproducing runs.function-calling evaltool-use benchmarking
CH

Chroma

RAG · Hosted vector DB (not an LLM)
8.1

Embedded, developer-friendly vector store for Python.

Freemium· Starter: $0 · Team: $250 · Enterprise: Customprototypingembedded RAG
MA

Mastra

Agents · Multi-model (90+ providers)
8.1

Open-source TypeScript framework for building, deploying, and observing AI agents and workflows.

Freemium· Starter: $0 · Teams: $250 · Enterprise: Custom pricingai-agentsworkflow-orchestration
ML

MLflow

Evaluation · Multi-model
8.1

Open-source platform for tracking, evaluating, and deploying ML models and LLM applications.

Free· Free and open source (Apache 2.0); managed offering via Databricksllm-evaluationexperiment-tracking
OE

OpenAI Evals

Evaluation · OpenAI GPT models (extensible)
8.1

OpenAI's open-source framework for benchmarking LLMs against a shared registry of evaluations.

Free· Free (MIT); you pay OpenAI API costs for eval runsllm-benchmarkingregression-testing
OP

Optuna

Fine-tuning
8.1

Open-source Python framework for automated hyperparameter optimization across any ML stack.

Free· Free and open source (MIT)hyperparameter-tuningml-experiment-tracking
PY

PyGPT

Writing · Multi-model (GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Ollama)
8.1

Open-source desktop AI assistant that wires every major LLM provider into one local app with agents, vision, and a code interpreter.

Free· Free and open-source (MIT); bring your own provider API keysdesktop-ai-assistantchat-with-files
RA

RAGFlow

RAG · Multi-model
8.1

Open-source RAG engine with deep document parsing, hybrid search, and visual agent orchestration.

Freemium· Free tier; Starter $29/mo; Pro $129/mo; Enterprise customdocument-qaenterprise-search
RT

Ray Tune

Fine-tuning
8.1

Open-source Python library for distributed hyperparameter tuning at any scale.

Free· Open-source (Apache 2.0); managed via Anyscale offers a $100 starting credithyperparameter-tuningdistributed-training
RE

Repomix

Coding · ChatGPT, Claude, Gemini, Grok
8.1

Packs an entire codebase into a single AI-friendly file so LLMs can actually read your repo.

Free· Free and open source (MIT)codebase-to-llmcode-review
TR

TruLens

Evaluation · Multi-model (LLM-as-judge)
8.1

Open-source evaluation and tracing framework for LLM apps and agents, built on OpenTelemetry.

Free· Free, open source (Apache-licensed Python package)llm-evaluationrag-evaluation
CA

CAMEL-AI

Agents · Multi-model
8.0

Open-source Python framework for building multi-agent systems and synthetic data pipelines.

Free· Free, open-source; pay for the underlying LLM API callsmulti-agent-systemssynthetic-data-generation
GC

Gemini CLI

Agents · Gemini 3
8.0

Google's open-source terminal agent that brings Gemini 3 into your shell for codebase edits and workflow automation.

Freemium· Free tier with Google account; paid via Google One / AI subscriptionsterminal-coding-agentcodebase-editing
OP

OpenHands

Agents · Multi-model (Claude, Gemini, GPT/Codex)
8.0

Open-source autonomous coding agent that plans, edits, and ships changes across real codebases.

Freemium· Open Source: Free · Individual: Free · Enterprise: Custom pricingautonomous-codingpr-review
RI

Rivet

Agents · Multi-model
8.0

Open-source visual IDE for building and debugging LLM agent graphs.

Free· Free and open source (MIT)agent-orchestrationprompt-chaining
WA

Wren AI

RAG · Multi-model (OpenAI, Anthropic, Gemini, self-hosted)
8.0

Open-source GenBI semantic layer that lets AI agents query your warehouse in natural language with governed, accurate SQL.

Freemium· Free: $0 · Essential Cloud: $179 · Enterprise Cloud: $559 · Enterprise Plus: Contact Ustext-to-sqlsemantic-layer
AN

AnythingLLM

RAG · Multi-model
7.9

Open-source desktop and self-hosted app that turns your documents into a private chat-and-agent workspace.

Freemium· Basic: $50/monthly · Pro: $99/monthly · Enterprise: Contact Usdocument-chatprivate-rag
BI

Bing Image Creator

Image Generation · DALL-E 3 (transitioning to Microsoft's newer image/video model)
7.9

Microsoft's free text-to-image generator built into Bing, with daily boost credits and mobile video.

Free· Free; 10 fast generations/day, unlimited slow queue, extra boosts via Microsoft Rewardstext-to-imagetext-to-video
CO

Continue

Coding · BYO (any OpenAI-compatible API + Ollama for local)
7.9

Open-source, self-hostable VS Code/JetBrains AI assistant.

Free· Free / open-source; you pay model costsself-hostedopen source
LS

LLM Stats

Evaluation · Multi-model
7.9

Live leaderboard and side-by-side comparison hub for 300+ frontier LLMs across reasoning, coding, and multimodal benchmarks.

Free· Free to browse; underlying model usage billed by each providermodel-comparisonbenchmark-tracking