Best Open-Source AI Tools, Ranked by GitHub Stars

n8n is an open-source workflow automation platform that lets users build complex automations through a visual, node-based interface

Turn websites into clean, LLM-ready data with a simple API.

Run open LLMs locally with a single command.

Open-source platform for building production-ready LLM apps and agents.

Langflow is an open-source, low-code visual builder for creating AI agents, RAG applications, and MCP servers

Framework and platform for building LLM apps and agents

High-throughput open-source LLM inference engine

Open-source library for fast, memory-efficient LLM fine-tuning

Open-source autonomous coding agent for VS Code that runs on your own model API keys.

Microsoft's multi-agent conversation framework (now in maintenance mode).

Open-source AI gateway to call 100+ LLM APIs in one format

Data framework for LLM apps and knowledge agents

An open-source terminal pair-programmer that edits your code and commits to git.

Open-source vector database built for scale

Graph-based orchestration for stateful, controllable LLM agents.

Continue is an open-source AI coding assistant that brings autocomplete, in-IDE chat, and agentic edits to VS Code and JetBrains, with support for any model.

Open-source LLM observability and evaluation

High-performance open-source vector search engine

Open-source, self-hosted AI coding assistant you run on your own hardware

AI search and chat across your company apps.

Open-source embedding database for AI apps

The TypeScript framework for building AI agents and workflows.

Microsoft's enterprise SDK for orchestrating LLMs, plugins, and agents.

deepset's composable open-source framework for RAG and agent pipelines.

Stateful AI agents with long-term memory (formerly MemGPT).

Open-source text-to-SQL framework using RAG and LLMs

Open-source AI agent for browser automation

Open-source LLM evaluation, tracing, and observability by Comet.

Open-source LLM evaluation framework with pytest-style testing.

Open-source AI-native vector database

Open-source evaluation toolkit for RAG and LLM applications.

An all-in-one platform for building and deploying LLM-powered AI agents.

Open-source AI gateway and control plane for production Gen AI.

Open-source LLM and agent observability built on OpenTelemetry.

AI coding agent built for JetBrains IDEs

Open-source LLM observability built on OpenTelemetry

Open-source LLM observability and AI gateway in one line of code.

Visually build and edit a real React app with AI.

Describe a UI in plain language and see it built, live.

The big directory of MCP servers.

A professional local studio for AI image generation.

Scan, OCR, and search all your documents.

A curated list of Claude Code resources.

Transcribe and caption audio offline on your computer.

Build and deploy full-stack web apps with any LLM.

Official reference MCP server implementations.

Anthropic's official Agent Skills and spec.

100+ production Claude Code subagents.

Chat privately with your own documents using any AI model.

202 agents, 184 skills and 105 commands in 94 plugins.

Anthropic's official role plugins for knowledge work.

Official starter projects for building on Claude.

Production-grade engineering skills for AI coding agents.

Enlarge and sharpen images with AI, offline and free.

Run open-source AI chatbots offline on your own computer.

A self-hosted AI answer engine that searches the web with citations.

An open-source Notion alternative you can self-host.

A privacy-first note and knowledge app with built-in AI.

~170 role-based AI agents organized like a company.

A CLI catalog of Claude Code agents, commands and MCPs.

One clean desktop app for ChatGPT, Claude, Gemini and local models.

A private, self-hosted toolbox for everything PDF.

A local-first AI notetaker for your meetings.

Build a self-hosted second brain and personal wiki.

Fine-tune open LLMs with no code.

Clone a voice from a short sample and generate speech.

Open-source plugin that docks Claude Code inside the Unreal Editor

MCP server that lets an AI agent drive the Unreal Editor

Expansion of Unreal 5.8's native MCP with deep editor and profiling tools

Unreal plugin wiring Claude, GPT and Gemini into UE5 (no GPU needed)

Apache-2.0 MCP server that gives an AI agent a Unity Editor build-and-test loop

MCP server that lets an agent run your Godot game and read back the errors

Claude Code configuration pack: 49 agent personas + skills for game dev

Official NVIDIA tech: audio in, lip-sync and facial animation out

Apache-2.0 text-to-music model: full songs, commercial use OK

Run a local LLM from a single file, no install.

A free, self-hostable translation API.

An all-in-one embeddings database for search and RAG.

Turn scripts into workflows, APIs, and internal tools.

Node-based local image and video generation.

Convert PDFs and documents to clean Markdown.

An AI email assistant that cleans up your inbox.

A self-hosted chat-with-your-documents app with citations.

Fast local speech-to-text for your own apps.

A fast, fully local text-to-speech engine.

Run open LLMs locally with a simple interface.

One self-hosted chat app for many AI providers.

A polished self-hosted ChatGPT-style interface for any model.

Self-hosted photo library with AI search and face recognition.

Dead-simple local image generation from a prompt.

A self-hosted AI second brain for your notes and docs.

A self-hosted, OpenAI-compatible API you fully control.

Fast offline speech-to-text on your own machine.

Turn PDFs and Office files into clean, AI-ready text.

Ask questions about your documents, fully offline.

A slick multi-provider AI chat UI you can self-host.

Local-first memory for AI coding agents, via one MCP service