Open-source AI

33 AI tools whose code is public on GitHub: free to download, run on your own computer and look inside. Ranked by Tool Score = 0.40·usefulness + 0.30·ease & price + 0.30·trust. Star counts are a snapshot from the date shown.

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1. 8.7

   Ollama Agent builders

   Verdict: Run open AI models like Llama, Qwen and Gemma on your own computer with one command, plus an optional cloud.

   Free (open source), cloud plans · GitHub repo · ★ 184k stars (2026-10-21) · official site

2. 8.4

   n8n Agent builders

   Verdict: Best for no/low-code agent builders: visual workflows with AI agent nodes and 400+ integrations, self-hostable.

   Free self-host, cloud plans · GitHub repo · ★ 208k stars (2026-10-21) · official site

3. 8.4

   Supabase Vibe coding

   Verdict: Postgres database, logins, file storage and vector search in one; the default backend for many AI-built apps.

   Free tier, paid plans · GitHub repo · ★ 113k stars (2026-10-21) · official site

4. 8.4

   PyTorch AI frameworks & libraries

   Verdict: The most popular toolkit for building and training your own AI models in Python. Most new research and open models are built with it; start with the beginner tutorials on the site.

   Free (open source) · GitHub repo · ★ 105k stars (2026-10-21) · official site

5. 8.3

   Keras AI frameworks & libraries

   Verdict: The friendliest way to build a neural network in Python: short, readable code that runs on top of JAX, TensorFlow or PyTorch.

   Free (open source) · GitHub repo · ★ 64.4k stars (2026-10-21) · official site

6. 8.3

   scikit-learn AI frameworks & libraries

   Verdict: The classic starter library for machine learning in Python: predict, classify and group your own data (like spreadsheets) with simple, well-documented tools.

   Free (open source) · GitHub repo · ★ 67.9k stars (2026-10-21) · official site

7. 8.1

   Hugging Face Transformers AI frameworks & libraries

   Verdict: Download and use thousands of ready-made AI models for text, images and audio with a few lines of Python, without training anything yourself.

   Free (open source) · GitHub repo · ★ 168k stars (2026-10-21) · official site

8. 8.1

   LlamaIndex Agent builders

   Verdict: Python framework for building RAG and document agents over your own data, with hundreds of data connectors. A standard choice for LLM apps on private docs.

   Free (MIT open source); LlamaCloud paid · GitHub repo · ★ 52.6k stars (2026-10-21) · official site

9. 8

   OOpenAI Agents SDK Agent builders

   Verdict: Lightweight official SDK with tools, handoffs and guardrails: minimal boilerplate.

   Open source (pay for API usage) · GitHub repo · ★ 30.2k stars (2026-10-21) · official site

10. 8

    Dify Agent builders

    Verdict: Open-source visual LLM app and agent builder with RAG built in.

    Open source, cloud plans · GitHub repo · ★ 159k stars (2026-10-21) · official site

11. 8

    Docling Spreadsheets & data

    Verdict: Open-source toolkit (from IBM Research, now LF AI) that converts PDFs, Office files and scans into clean Markdown/JSON for RAG and agents, with layout and table understanding.

    Free (MIT open source) · GitHub repo · ★ 69.3k stars (2026-10-21) · official site

12. 7.8

    LangGraph Agent builders

    Verdict: Best for developers who need controllable, stateful multi-step agents in Python/JS.

    Open source, paid platform · GitHub repo · ★ 43.7k stars (2026-10-21) · official site

13. 7.8

    Whisper (OpenAI) Audio, music & speech

    Verdict: OpenAI's open-source speech recognition model. Excellent accuracy; needs some setup.

    Free (open source) · GitHub repo · ★ 111k stars (2026-10-21) · official site

14. 7.8

    LangChain Agent builders

    Verdict: The most widely used open-source framework for building LLM apps and agents, from the makers of LangGraph and LangSmith.

    Open source, paid LangSmith · GitHub repo · ★ 148k stars (2026-10-21) · official site

15. 7.7

    CrewAI Agent builders

    Verdict: Simple role-based multi-agent 'crews' in Python: an easy first framework.

    Open source, paid platform · GitHub repo · ★ 60.0k stars (2026-10-21) · official site

16. 7.7

    Tavily Agent builders

    Verdict: Web search and extract API made for AI agents and RAG, a common default search tool in agent frameworks.

    Free credits, paid API · GitHub repo · ★ 2.5k stars (2026-10-21) · official site

17. 7.7

    AAwesome Opus 5.5 Videos Video & images

    Verdict: Best starting point for making videos with Claude: a curated awesome-list of code-rendered Claude Opus 5.5 videos with the prompts behind each.

    Free (MIT) · GitHub repo · ★ 8.4k stars (2026-10-21) · official site

18. 7.7

    Haystack Agent builders

    Verdict: deepset's open-source Python framework for production RAG pipelines and agents, with modular components and broad model and vector-DB support.

    Free (Apache-2.0 open source); deepset platform paid · GitHub repo · ★ 26.8k stars (2026-10-21) · official site

19. 7.7

    RAGFlow Agent builders

    Verdict: Self-hostable RAG engine with deep document parsing, a web UI and agent workflows. For teams who want a ready-made knowledge-base chat over their files.

    Free (Apache-2.0 open source, self-host) · GitHub repo · ★ 92.6k stars (2026-10-21) · official site

20. 7.7

    Crawl4AI Agent builders

    Verdict: Open-source, LLM-friendly web crawler and scraper that turns pages into clean Markdown for RAG and agents. A free self-hosted alternative to Firecrawl.

    Free (Apache-2.0 open source) · GitHub repo · ★ 86.0k stars (2026-10-21) · official site

21. 7.6

    Flowise Agent builders

    Verdict: Drag-and-drop agent and chatbot builder, easy to self-host.

    Open source, cloud plans · GitHub repo · ★ 55.5k stars (2026-10-21) · repo archived · official site

22. 7.4

    Cline Vibe coding

    Verdict: Open-source coding agent in VS Code that plans, edits files and runs commands with your approval, using the model of your choice.

    Open source (pay for model usage) · GitHub repo · ★ 70.7k stars (2026-10-21) · official site

23. 7.4

    E2B Agent builders

    Verdict: Secure cloud sandboxes where AI agents can safely run code, use a browser and work with files.

    Free credits, pay per use · GitHub repo · ★ 14.5k stars (2026-10-21) · official site

24. 7.4

    Langfuse Agent builders

    Verdict: Open-source monitoring for AI agents: see every step, cost and error, and test prompts and quality over time.

    Open source, cloud free tier · GitHub repo · ★ 36.1k stars (2026-10-21) · official site

25. 7.4

    Qdrant Agent builders

    Verdict: Open-source vector search engine for RAG and AI memory, run it yourself or in Qdrant Cloud.

    Open source, cloud free tier · GitHub repo · ★ 35.2k stars (2026-10-21) · official site

26. 7.4

    TensorFlow AI frameworks & libraries

    Verdict: Google's open-source machine learning library. Good for putting models into apps, phones and browsers; beginners usually start with its built-in Keras API.

    Free (open source) · GitHub repo · ★ 201k stars (2026-10-21) · official site

27. 7.4

    GPT Researcher Research

    Verdict: Open-source autonomous research agent that searches the web and local docs and writes cited reports. For developers who want a self-hosted deep-research agent.

    Free (Apache-2.0 open source; bring your own LLM/search API keys) · GitHub repo · ★ 30.2k stars (2026-10-21) · official site

28. 7.1

    Stable Diffusion (Stability AI) Video & images

    Verdict: Stability AI's image models, including SDXL. The open-weights classic for people who want control and local runs.

    Pricing not verified · GitHub repo · ★ 27.3k stars (2026-10-21) · official site

29. 7.1

    OpenClaw General assistants

    Verdict: Open-source AI assistant that runs on your own machine and works from WhatsApp, Telegram and other chat apps.

    Free (open source) · GitHub repo · ★ 393k stars (2026-10-21) · official site

30. 7

    Oxylabs Web API MCP server Agent builders

    Verdict: Self-hostable MCP server that lets agents use the Oxylabs Web API. Official Oxylabs repo; agent skills live in oxylabs/web-api-skills.

    Free (MIT open source; API usage paid separately) · GitHub repo · ★ 13 stars (2026-10-21) · official site

31. 7

    LLemo-Opuscar Video & images

    Verdict: Claude Code skill for short films with no video model: 51 film styles, each with a style prompt and an example film made entirely in code.

    Free (MIT) · GitHub repo · ★ 4.9k stars (2026-10-21) · official site

32. 6.7

    CClaude Animation Base Video & images

    Verdict: Starter kit for hand-painted cartoon animation with Claude in p5.js + p5.brush, with a character rig and 31 expressions.

    Free (MIT) · GitHub repo · ★ 1.5k stars (2026-10-21) · official site

33. 6.7

    SSearXNG Research

    Verdict: Privacy-respecting self-hosted metasearch engine that aggregates 70+ search services. Often used as a free, keyless web-search backend for local AI agents.

    Free (AGPL-3.0 open source, self-host) · GitHub repo · ★ 38.7k stars (2026-10-21) · official site