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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.

#1langchain-ai/langchain

🦜🔗 The platform for reliable agents.

127,110Python
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#2affaan-m/everything-claude-code

Complete Claude Code configuration collection - agents, skills, hooks, commands, rules, MCPs. Battle-tested configs from an Anthropic hackathon winner.

49,031JavaScript
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#3Aider-AI/aider

aider is AI pair programming in your terminal

40,807Python
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#4BerriAI/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]

36,503Python
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#5danny-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.

34,010TypeScript
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#6code-yeongyu/oh-my-opencode

the best agent harness

32,806TypeScript
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#7asgeirtj/system_prompts_leaks

Collection of extracted System Prompts from popular chatbots like ChatGPT, Claude & Gemini

32,374HTML
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#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.

29,742TypeScript
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#9wshobson/agents

Intelligent automation and multi-agent orchestration for Claude Code

29,043Python
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#10simstudioai/sim

Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.

26,503TypeScript
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#11hesreallyhim/awesome-claude-code

A curated list of awesome skills, hooks, slash-commands, agent orchestrators, applications, and plugins for Claude Code by Anthropic

24,469Python
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#12yamadashy/repomix

📦 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 Language Models (LLMs) or other AI tools like Claude, ChatGPT, DeepSeek, Perplexity, Gemini, Gemma, Llama, Grok, and more.

21,983TypeScript
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#13vercel/ai

The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents

21,928TypeScript
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#14davila7/claude-code-templates

CLI tool for configuring and monitoring Claude Code

21,027Python
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#15winfunc/opcode

A powerful GUI app and Toolkit for Claude Code - Create custom agents, manage interactive Claude Code sessions, run secure background agents, and more.

20,624TypeScript
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#16dyad-sh/dyad

Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!

19,661TypeScript
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#17Canner/WrenAI

⚡️ GenBI (Generative BI) queries any database in natural language, generates accurate SQL (Text-to-SQL), charts (Text-to-Chart), and AI-powered business intelligence in seconds.

14,443TypeScript
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#18xonsh/xonsh

🐚 Python-powered shell. Full-featured, cross-platform and AI-friendly.

9,221Python
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#19friuns2/BlackFriday-GPTs-Prompts

List of free GPTs that doesn't require plus subscription

9,160
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