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📖 The AI Tool Bible

AI tools tagged Oss License Mit

29 tools matching this tag.tech

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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
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
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
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
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
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
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
AU

AutoGPT

Agents · BYO (Claude / GPT / open)
7.5

Open-source platform for building autonomous AI agents.

Free· Free / open-source; hosted platform paidautonomous agentstask automation
OS

OpenAI Swarm

Agents · OpenAI models (designed for, but extensible)
7.4

Lightweight multi-agent orchestration in Python.

Free· Free / open-sourceeducationprototyping
OL

Ollama

Coding · Multi-model (Llama, Qwen, Gemma, DeepSeek, Mistral, Phi, etc.)
7.2

The de facto runtime for running open-weights LLMs locally, now with a paid cloud tier for bigger models.

Freemium· Free local; Pro $20/mo; Max $100/molocal-llmself-hosted-inference
MO

MockingBird

Audio · GE2E + Tacotron + HiFi-GAN/WaveRNN/Fre-GAN
7.0

Open-source Mandarin-first voice cloning that mimics a speaker from a 5-second sample.

Free· Free, open source (MIT)voice-cloningtext-to-speech
CU

Chatbot UI

Writing · Multi-model (OpenAI, Anthropic, Google, Mistral, Meta, etc.)
6.9

Open-source unified chat interface for 80+ frontier AI models.

Freemium· Free tier on hosted app; self-host is free (bring your own API keys)multi-model chatprompt management
HA

Harmonai

Audio · Dance Diffusion / Stable Audio family
6.8

Open-source generative audio lab from Stability AI building diffusion models for music production.

Free· Free open-source models and code; no hosted product on this sitemusic-generationsound-design
AP

AI Prompt Genius

Writing
6.5

Open-source Chrome extension for building a searchable, tagged library of reusable AI prompts.

Free· Free and open-sourceprompt-libraryprompt-templates
DO

Docling

RAG · GraniteDocling 258M and other vision-language models

Open-source document parsing for AI: PDFs, Office files, audio and video into clean, structured Markdown/JSON

Free· Free and open source under MIT License. Hosted by the LF AI & Data Foundation; no paid tiers.RAG document ingestionPDF table extraction
HI

HiDream

Image Generation · HiDream-I1 (17B diffusion transformer) — Full, Dev, Fast variants

Open-source 17B image model with frontier quality, hosted on Vivago and free to self-host under MIT.

Freemium· 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.text-to-image generationconcept art and illustration
ME

MCP Everything Server

MCP Servers

The kitchen-sink reference MCP server that exercises every corner of the Model Context Protocol

Free· 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.MCP client conformance testingRegression testing of stdio and Streamable HTTP transports
MF

MCP Filesystem Server

MCP Servers

Reference MCP server that gives Claude, Cursor, and other MCP clients scoped read/write access to your local filesystem.

Free· Free and open source (MIT). Self-hosted; no vendor cost.Give Claude Desktop scoped access to a code repoLet Cursor or VS Code agents edit project files via MCP
MG

MCP Git Server

MCP Servers

Reference MCP server that lets any LLM read, search, and manipulate local Git repositories.

Free· Free and open source (MIT License). Self-hosted; you pay only for the compute wherever you run it.AI-drafted commit messages from staged diffsAssistant-led code review of unstaged changes
MM

MCP Memory Server

MCP Servers

Persistent knowledge-graph memory for Claude and other MCP clients

Free· Free and open source (MIT). Self-hosted; no vendor charges. Runs locally via npx or Docker.Persistent Claude Desktop memory across chatsLong-lived coding-agent project memory
MP

MCP Python SDK

MCP Servers

Official Python SDK for building Model Context Protocol servers and clients.

Free· Free, MIT-licensed open source.Exposing internal REST APIs as MCP tools for Claude DesktopWrapping a Postgres or SQLite database as an MCP server
MT

MCP TypeScript SDK

MCP Servers

Official TypeScript SDK for building Model Context Protocol servers and clients.

Free· Free and open source (Apache 2.0 for new contributions; older code MIT).Wrapping an internal REST API as an MCP serverExposing a database to Claude Desktop as tools and resources
SC

Scrapling

Agents

Adaptive Python web-scraping framework with a built-in MCP server for AI coding agents.

Free· 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.MCP-driven web scraping from Claude DesktopAgent-powered research and browsing
ST

Sequential Thinking MCP Server

MCP Servers

Reference MCP server for structured, revisable step-by-step reasoning in any MCP host.

Free· Free and open-source under the MIT License. No paid tiers; install via npx or Docker at no cost.Multi-step engineering planningProduction debugging walkthroughs
SP

spaCy

Coding · in-house (Cython statistical models); optional transformer backbones (BERT, RoBERTa, Hugging Face)

Industrial-strength natural language processing in Python.

Free· Free and open source (MIT license). Commercial support and consulting available separately via Explosion AI.Named entity recognitionCustom entity training on domain corpora