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Free and open-source AI tools
33 AI tools released as open-source software. Tools marked Free here are open-source projects whose license we confirmed in the project's repository. You may still pay for hosting or for a hosted version.
How to read this page. The tools are grouped by category and are not ranked. Pricing labels come from vendors' own pages when we could confirm them. Always verify plans and limits on the vendor's site.
Chatbots & Assistants (2)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| GPT4All | Open-source desktop chat app from Nomic for running language models locally. | Free | Official site |
| Meta AI | Meta's AI assistant, available on the web and across Meta apps. | Free | Official site |
Image Generation (1)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Upscayl | Open-source desktop app for upscaling images. | Free | Official site |
Voice & Speech (2)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| OpenAI Whisper | OpenAI's open-source speech recognition model for multilingual transcription. | Free | Official site |
| Pipecat | Open-source framework for building real-time voice and multimodal conversational agents. | Free | Official site |
Coding (2)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Aider | Open-source AI pair programming in your terminal (bring your own model API key). | Free | Official site |
| Cline | Open-source coding agent that runs in your editor and uses your choice of model. | Free | Official site |
AI Agents & Frameworks (9)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| AutoGen | Microsoft's open-source framework for building multi-agent applications. | Free | Official site |
| CAMEL-AI | Open-source community and framework for multi-agent research. | Free | Official site |
| DSPy | Framework for programming rather than prompting language models. | Free | Official site |
| Google Agent Development Kit | Google's open-source toolkit for building and deploying AI agents. | Free | Official site |
| Haystack | Open-source framework from deepset for building search, RAG and agent pipelines. | Free | Official site |
| OpenAI Agents SDK | OpenAI's lightweight Python framework for multi-agent workflows. | Free | Official site |
| Pydantic AI | Python agent framework from the Pydantic team focused on type safety. | Free | Official site |
| Semantic Kernel | Microsoft's SDK for integrating AI models and agents into applications. | Free | Official site |
| smolagents | Hugging Face's minimal library for building agents that write code. | Free | Official site |
Browser Agents (1)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Nanobrowser | Open-source Chrome extension for running multi-agent web automation. | Free | Official site |
MCP Servers & Registries (2)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| GitHub MCP Server | GitHub's official MCP server for repositories, issues and pull requests. | Free | Official site |
| Playwright MCP | Microsoft's MCP server that lets agents drive a browser with Playwright. | Free | Official site |
Vector Databases (2)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| FAISS | Meta's open-source library for efficient similarity search over dense vectors. | Free | Official site |
| pgvector | Open-source vector similarity search extension for PostgreSQL. | Free | Official site |
AI Developer Tools (11)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Axolotl | Open-source tool for fine-tuning language models. | Free | Official site |
| Docling | Open-source toolkit for converting documents into structured formats for AI. | Free | Official site |
| Gradio | Python library for building and sharing web demos of machine learning models. | Free | Official site |
| Instructor | Library for getting structured outputs from language models. | Free | Official site |
| llama.cpp | Open-source C/C++ library for running language models efficiently on local hardware. | Free | Official site |
| MLflow | Open-source platform for managing the machine learning and GenAI lifecycle. | Free | Official site |
| Outlines | Library for constraining language model output to defined structures. | Free | Official site |
| Ragas | Open-source toolkit for evaluating retrieval-augmented generation applications. | Free | Official site |
| Ray | Open-source framework for scaling Python and AI workloads. | Free | Official site |
| Streamlit | Python framework for building data and AI web apps. | Free | Official site |
| vLLM | Open-source high-throughput inference engine for large language models. | Free | Official site |
Research & Search (1)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Semantic Scholar | Free AI-powered search engine for scientific literature. | Free | Official site |