Best Open Source AI Tools

The GitHub of AI — host, discover, and collaborate on 500K+ models, datasets, and AI apps

Unified API router for 100+ LLMs — one endpoint, automatic model routing, and cost optimisation

Run Llama, Mistral, Gemma, and 100+ open AI models locally on your Mac, Windows, or Linux machine

Desktop app to discover, download, and run local LLMs with a ChatGPT-style UI and a local API server

Open-source TypeScript toolkit for building AI-powered web apps with streaming, tool use, and any model

Open-source workflow automation with AI integrations and a visual node-based builder

Meta's open-source large language model family powering thousands of AI apps

Open-source AI vector database for LLM retrieval-augmented generation applications

Fast AI inference platform with optimised open-source LLMs and custom fine-tuning

Open-source vector database with built-in ML models for semantic search, RAG, and hybrid search

Open-source infinite canvas whiteboard with AI-powered drawing and diagram generation

High-performance open-source vector database written in Rust for production-grade similarity search

Platform for deploying and serving open-source AI models in production with autoscaling

End-to-end LLM evaluation and monitoring platform for building reliable AI products faster

Chinese frontier AI model matching GPT-4 performance at a fraction of the cost — open weights available

Free open-source whiteboard with AI diagram generation — sketch-style visuals from a text prompt

Open-source workflow automation with 400+ integrations and native AI node support — self-hostable

Open-source LLM app development platform — build, deploy, and manage AI workflows and chatbots at scale

Open-source product analytics, feature flags, session replay, and A/B testing — self-hostable all-in-one

Run and deploy open-source AI models via API — thousands of models with no infrastructure setup

AI grammar, style, and spell checker supporting 30+ languages in any app

Open-source LLM observability — trace, debug, and evaluate AI applications in production

Open-source AI image generation powering Stable Diffusion and frontier visual models

Open-source visual builder for LangChain-based AI agents and LLM applications

Multi-agent framework for orchestrating collaborative AI workers in production systems

Open-source conversational AI platform for building production-grade chatbots and agents

Developer tool for turning websites into clean, AI-ready markdown and structured crawl data

Enterprise AI platform built on Ray — scale LLM training and inference across any infrastructure

Open source coding agent for planning, editing files, and executing development tasks

Always-on virtual coworker platform for browser automation, research, data collection, and agent-driven web work

Private EU GPU server rental platform for AI and ML workloads with one-click templates and full root access

The most popular open-source framework for building LLM-powered apps with chains, agents, and RAG

European AI company delivering efficient open and proprietary LLMs that punch above their weight class

Open-source data framework for connecting LLMs to your data — index, query, and build RAG applications

Free AI code acceleration toolkit with fast completions, chat, and search across 70+ languages

Open-source visual builder for LangChain apps — drag-and-drop AI pipelines and chatbots without code