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
#3affaan-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.
#4Aider-AI/aider
aider is AI pair programming in your terminal
#5code-yeongyu/oh-my-openagent
omo; the best agent harness - previously oh-my-opencode
#6BerriAI/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]
#7thedotmack/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.
#8danny-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.
#9asgeirtj/system_prompts_leaks
Collection of extracted System Prompts from popular chatbots like ChatGPT, Claude & Gemini
#10wshobson/agents
Intelligent automation and multi-agent orchestration for Claude Code
#11hesreallyhim/awesome-claude-code
A curated list of awesome skills, hooks, slash-commands, agent orchestrators, applications, and plugins for Claude Code by Anthropic
#12simstudioai/sim
Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.
#13dyad-sh/dyad
Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!
#14guillaumemeyer/watermarks-remover
A privacy-first app that strips AI watermarks from content you own.
#15stackblitz/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
#16langchain4j/langchain4j
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 vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.
#17lidge-jun/opencodex
Universal provider proxy for OpenAI Codex & Claude Code — use any LLM (Claude, Gemini, Grok, DeepSeek, Ollama…) with Codex CLI, App, SDK, and Claude Code
#18vxcontrol/pentagi
✨ Fully autonomous AI Agents system capable of performing complex penetration testing tasks
#19aden-hive/hive
Outcome driven agent development framework that evolves
#20rtk-ai/rtk
CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies
#21xonsh/xonsh
🐚 Python-powered shell. Full-featured, cross-platform and AI-friendly.
#22friuns2/BlackFriday-GPTs-Prompts
List of free GPTs that doesn't require plus subscription
#23travisvn/awesome-claude-skills
A curated list of awesome Claude Skills, resources, and tools for customizing Claude AI workflows — particularly Claude Code
#24Arize-ai/phoenix
AI Observability & Evaluation
#25open-multi-agent/open-multi-agent
TypeScript AI agent orchestration framework with dynamic workflows. Describe the goal, not the graph: a coordinator plans the task DAG at runtime and runs it on any LLM (Claude, ChatGPT, Gemini, DeepSeek, or local models).
#26tbphp/gpt-load
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：多渠道多凭据统一接入，含密钥与订阅账号、调度容错、日志与用量。
#27FlorianBruniaux/claude-code-ultimate-guide
The most comprehensive Claude Code guide: agentic workflows, hooks, skills, MCP servers, quizzes, and production-ready templates. 430K+ lines.
#28stickerdaniel/linkedin-mcp-server
Open-source MCP server for LinkedIn. Give Claude and any MCP-compatible AI agent access to profiles, companies, jobs, and messages.
#29TanStack/ai
🤖 Type-safe, provider-agnostic TypeScript AI SDK for streaming chat, tool calling, agents, and multimodal apps across OpenAI, Anthropic, Gemini, React, Vue, Svelte, and Solid.
#30asklokesh/loki-mode
Multi-agent autonomous SDLC framework. Spec to deployed app. PRD, GitHub issue, OpenAPI/JSON/YAML, or one-line brief. 5 AI providers, 8 quality gates.
#31Hao0321/claude-skill-social-post
A Claude Code skill by Hao (駱君昊) that learns your Facebook voice and auto-posts to FB / IG / Threads / X with a 14-day content calendar. Mega-viral validated: 80K reach / 448 likes / 500 comments on first post. Includes Day 2 flop postmortem.
#32nodetool-ai/nodetool
The open-source, agent-first creative workspace.
#33GizClaw/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.
#34yonatangross/orchestkit
The Complete AI Development Toolkit for Claude Code. 106 skills, 36 agents, 171 hooks. Install `ork` for stable (v9.x), or `ork-alpha` for the v10 line, which ships daily.
#35AlexMili/Awesome-MCP
Awesome ModelContextProtocol resources - A curated list of MCP resources
#36thenicolas1894/awesome-claude-fable-5-prompt-vault
Ultimate Claude Fable 5 Guide 2026: Use Cases, Integrations & Benchmarks
#37kanguruonline/claude-batchy-bulk
Slash API Batch: Cut AI Costs by 50% in 2026
#38arun2990/menu-bar-token-economy
Best AI API Cost Tracker & Token Usage Monitor for Developers 2026
#39Sma1lboy/rove
Rove — the agent multiplexer for your terminal. Run coding agents on parallel tasks with isolated worktrees and persistent sessions.
#40hanyeol/model-compose
Deploy production-ready AI services in minutes. One YAML file for agents, RAG pipelines, and MCP servers — run anywhere. Inspired by docker-compose.
#41sleep2agi/agent-network
助力搭建你的数字 AI 员工军团 — 多 Agent 一行命令组网协作。Claude Code / Claude Agent SDK / Codex / Grok Build 4 runtime + 8+ 家 LLM（Anthropic / OpenAI / xAI / MiniMax / DeepSeek / GLM / Kimi / 书生 / 小米 MiMo），自带 Web Dashboard，Apache 2.0 开源。
#42Miosa-osa/OSA
An AI agent that lives on your computer and does the work you ask for, in plain words — from writing code to running your business busywork. Local, one command, any model.