Best Open Source anthropic Libraries
A curated list of the most popular GitHub repositories tagged with anthropic. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1NousResearch/hermes-agent
The agent that grows with you
#2langchain-ai/langchain
The agent engineering platform
#3JuliusBrussee/caveman
🪨 why use many token when few token do trick. Viral skill + proxy for coding agents that cuts 65% of tokens by talking like a caveman.
#4affaan-m/everything-claude-code
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
#5Aider-AI/aider
aider is AI pair programming in your terminal
#6code-yeongyu/oh-my-openagent
omo; the best agent harness - previously oh-my-opencode
#7BerriAI/litellm
Python SDK, Proxy Server (AI Gateway) to call 100+ LLM APIs in OpenAI (or native) format, with cost tracking, guardrails, loadbalancing and logging. [Bedrock, Azure, OpenAI, VertexAI, Cohere, Anthropic, Sagemaker, HuggingFace, VLLM, NVIDIA NIM]
#8thedotmack/claude-mem
A Claude Code plugin that automatically captures everything Claude does during your coding sessions, compresses it with AI (using Claude's agent-sdk), and injects relevant context back into future sessions.
#9can1357/oh-my-pi
⌥ Coding agent with the IDE wired in. Built by Stencil Labs.
#10danny-avila/LibreChat
Enhanced ChatGPT Clone: Features Agents, MCP, DeepSeek, Anthropic, AWS, OpenAI, Responses API, Azure, Groq, o1, GPT-5, Mistral, OpenRouter, Vertex AI, Gemini, Artifacts, AI model switching, message search, Code Interpreter, langchain, DALL-E-3, OpenAPI Actions, Functions, Secure Multi-User Auth, Presets, open-source for self-hosting. Active.
#11asgeirtj/system_prompts_leaks
Collection of extracted System Prompts from popular chatbots like ChatGPT, Claude & Gemini
#12wshobson/agents
Intelligent automation and multi-agent orchestration for Claude Code
#13hesreallyhim/awesome-claude-code
A curated list of awesome skills, hooks, slash-commands, agent orchestrators, applications, and plugins for Claude Code by Anthropic
#14simstudioai/sim
Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.
#15dyad-sh/dyad
Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!
#16xbtlin/ai-berkshire
AI 时代的伯克希尔：基于 Claude Code / Codex 的价值投资研究框架。巴菲特·芒格·段永平·李录四大师方法论 + 多Agent并行研究。| AI-era Berkshire: a value investing research framework built for Claude Code / Codex. 4 masters' methodologies + multi-agent adversarial analysis.
#17stackblitz/bolt.new
Prompt, run, edit, and deploy full-stack web applications. -- bolt.new -- Help Center: https://support.bolt.new/ -- Community Support: https://discord.com/invite/stackblitz
#18The-PR-Agent/pr-agent
🚀 PR Agent: The Original Open-Source PR Reviewer. This project is not the Qodo free tier.
#19cobusgreyling/loop-engineering
Practical patterns, starters & CLI tools for loop engineering with AI coding agents. Design systems that prompt and orchestrate agents (inspired by Addy Osmani and Boris Cherny). Includes loop-audit, loop-init, loop-cost.
#20vxcontrol/pentagi
✨ Fully autonomous AI Agents system capable of performing complex penetration testing tasks
#21aden-hive/hive
Outcome driven agent development framework that evolves
#22rtk-ai/rtk
CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies
#23xonsh/xonsh
🐚 Python-powered shell. Full-featured, cross-platform and AI-friendly.
#24friuns2/BlackFriday-GPTs-Prompts
List of free GPTs that doesn't require plus subscription
#25travisvn/awesome-claude-skills
A curated list of awesome Claude Skills, resources, and tools for customizing Claude AI workflows — particularly Claude Code
#26Arize-ai/phoenix
AI Observability & Evaluation
#27mnfst/llm-gateway
Open Source LLM Gateway 🦚
#28weave-os/router
Model router for agentic systems. Routes every prompt to the right model in <50ms. Cut costs 40-70% with just an endpoint change.
#29gptme/gptme
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!
#30MCPJam/inspector
Testing and evaluation platform to chat, inspect, and debug MCP servers, MCP apps, and ChatGPT apps.
#31rynfar/meridian
Use Claude and Antigravity with Pi, OpenCode and other coding clients. Local API bridge, usage dashboard and Mac app. Antigravity preview available in 1.74.0.
#32nottelabs/notte
Cloud browser infrastructure and web automation platform for your AI and coding agents
#33theopenco/llmgateway
Route, manage, and analyze your LLM requests across multiple providers with a unified API interface.
#34FranciscoMoretti/chat-js
Production-ready AI chat. Start here and make it your own. Formerly Sparka AI
#35asklokesh/loki-mode
Autonomous software factory. Give it a GitHub issue, a spec or a one-line task; get back a pull request with a signed receipt anyone can re-check offline. Runs on your machine with your own keys: Claude, Codex, OpenCode.
#36rampstackco/claude-skills
Stack-agnostic Claude Skills covering the full website lifecycle: brand, design, content, SEO, dev, ops, growth, and research. Build, ship, audit, optimize.
#37Storybloq/storybloq
Project memory and workflows for Claude Code and Codex. Keep stories, plans, handovers, and review evidence in your repo. Resume across sessions and follow progress in the Mac app.
#38mozilla-ai/otari
Open-source, OpenAI-compatible LLM gateway you run yourself. One endpoint for 40+ providers, with virtual keys, budgets, and usage tracking.
#39gakonst/nanocode
SDK for Frontier Embedded Agents.
#40redis/redis-vl-python
Redis Vector Library. The AI-native Python client for Redis.
#41GizClaw/flowcraft
Production-grade Go SDK for building AI agents with long-term memory, knowledge retrieval, and voice — runnable as a library, a daemon, or a real-time pipeline.
#42xberg-io/liter-llm
Universal LLM API client — 163 providers, 14 native language bindings, powered by a Rust core
#43api7/aisix
Open-source AI gateway for LLMs & AI agents, built in Rust. One OpenAI-compatible API for OpenAI, Anthropic, Gemini, Bedrock & more — routing, guardrails, caching, rate limits, observability.
#44linny006/trending-claude-skills
Auto-updated leaderboard of trending claude-skills and AI agent repos, refreshed every 15 minutes
#45Rich627/whatsapp-claude-plugin
Claude Code WhatsApp channel plugin — run AI directly from WhatsApp, voice transcription, remote tool approval, access control. No API keys, no Docker, just a linked device.