Open source anthropic projects
Every project in the registry tagged anthropic, ranked by real GitHub adoption.
Desktop AI agent with persistent memory across platforms
The agent engineering platform.
Persistent Context Across Sessions for Every Agent – Captures everything your agent does during sessions, compresses it with AI, and injects relevant context b
Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Li
LLM gateway for auth, load balancing, and spend tracking
AI pair programmer that works inside your terminal
One interface for all your AI models and conversations
⌥ Coding agent with the IDE wired in
Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders.
📦 Repomix is a powerful tool that packs your entire repository into a single, AI-friendly file. Perfect for when you need to feed your codebase to Large Langua
Build unlimited AI apps locally with zero vendor lock-in
LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and v
🚀 PR Agent: The Original Open-Source PR Reviewer. This project is not the Qodo free tier.
Open-source LLM tracing & evaluation for AI optimization
Practical patterns, starters & CLI tools for loop engineering with AI coding agents. Design systems that prompt and orchestrate agents (inspired by Addy Osmani
~95% on SimpleQA (e.g. Qwen3.6-27B on a 3090). Supports all local and cloud LLMs (llama.cpp, Ollama, Google, ...). 10+ search engines - arXiv, PubMed, your pri
Voice-to-text that works offline, privately, on any app
Self-hosted TypeScript agent runtime with durable approvals and verifiable run records. Own it, approve it, audit it.
Self-hosted AI gateway for multi-channel, multi-credential setups — API keys and subscription accounts, scheduling, failover, request logs and usage. 自托管 AI 网关：
Your agent in your terminal, equipped with local tools: writes code, uses the terminal, browses the web. Make your own persistent autonomous agent on top!
Open Source version of Claude Cowork with 500+ SaaS app integrations
AI API identity gateway — reverse proxy that normalizes device fingerprints and telemetry for privacy-preserving API proxying
👻 Proxy API gateway for Kiro IDE & CLI (Amazon Q Developer / AWS CodeWhisperer). Use free Claude models with any client.
Seamless integration between Claude Code AI assistant and Neovim
Unified API for all LLM providers with analytics
AI writes code. This automates everything else · 24 plugins · 49 agents · 44 skills · for Claude Code, OpenCode, Codex, Cursor, Kiro.
Local security audit for AI API relays and LLM proxies: detects prompt injection, model substitution, tool-call rewriting, SSE anomalies, error leakage, and Web
Long-term memory for AI assistants. Graph + vector store that recalls decisions, relationships, and context across sessions.
Give each AI agent its own isolated machine with root, Docker, and systemd. Active defense detects and stops threats automatically.
One-click, privacy-first exporter for Claude.ai chats — clean Markdown with artifacts and attachments, ready for Obsidian and RAG.
138 bilingual AI marketing skills (69 VN + 69 Global) for Claude Code, OpenCode, Codex, VS Code. Four role SOP packs — content, design, performance, leader ops
Build and deploy AI agents through visual workflows
LLM observability: cost, latency, and traces in one place
Related tags
Frequently asked questions
How many open source anthropic projects are there?
This registry tracks 33 projects tagged anthropic, with 926,495 GitHub stars between them. The most-adopted is Hermes Agent at 246,492 stars.
Are these anthropic projects free to use?
Yes — 29 of the 33 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which anthropic project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these anthropic projects still maintained?
28 of the 33 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.