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.
#1affaan-m/ECC
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
#2NousResearch/hermes-agent
The agent that grows with you
#3langchain-ai/langchain
The agent engineering platform
#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.
#5santifer/career-ops
Open-source AI job search: scan job portals, score listings A-F, tailor your CV, track applications — runs locally in your AI coding CLI (Claude Code, Gemini, Codex, OpenCode…)
#6headroomlabs-ai/headroom
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. Library, proxy, MCP server.
#7Aider-AI/aider
aider is AI pair programming in your terminal
#8code-yeongyu/oh-my-openagent
omo; the best agent harness - previously oh-my-opencode
#9BerriAI/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]
#10thedotmack/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.
#11danny-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.
#12asgeirtj/system_prompts_leaks
Collection of extracted System Prompts from popular chatbots like ChatGPT, Claude & Gemini
#13wshobson/agents
Intelligent automation and multi-agent orchestration for Claude Code
#14davila7/claude-code-templates
CLI tool for configuring and monitoring Claude Code
#15hesreallyhim/awesome-claude-code
A curated list of awesome skills, hooks, slash-commands, agent orchestrators, applications, and plugins for Claude Code by Anthropic
#16simstudioai/sim
Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.
#17diegosouzapw/OmniRoute
Never stop coding. Free MIT AI gateway: one endpoint, 268+ providers (50+ free), 500+ models — Claude, GPT, Gemini, Kimi K3, GLM, DeepSeek. Works with Claude Code, Codex, Cursor, Cline & Copilot. Quota-aware auto-fallback, RTK+Caveman compression saves 15-95% tokens, MCP/A2A, multimodal, Desktop/PWA. Built by 500+ contributors.
#18dyad-sh/dyad
Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!
#19Canner/WrenAI
GenBI (Generative BI) for AI agents, an open-source, governed text-to-SQL through an open context layer that turns natural-language questions into trusted dashboards, charts, and SQL across 20+ data sources, such as BigQuery, Snowflake, PostgreSQL, ClickHouse, Amazon Redshift, Databricks and more.
#20stackblitz/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
#21vxcontrol/pentagi
✨ Fully autonomous AI Agents system capable of performing complex penetration testing tasks
#22aden-hive/hive
Outcome driven agent development framework that evolves
#23rtk-ai/rtk
CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies
#24xonsh/xonsh
🐚 Python-powered shell. Full-featured, cross-platform and AI-friendly.
#25friuns2/BlackFriday-GPTs-Prompts
List of free GPTs that doesn't require plus subscription
#26travisvn/awesome-claude-skills
A curated list of awesome Claude Skills, resources, and tools for customizing Claude AI workflows — particularly Claude Code
#27Arize-ai/phoenix
AI Observability & Evaluation
#28mnfst/manifest
Connect Your Agents And Harnesses With Any Provider 🦚
#29osaurus-ai/osaurus
Own your AI. The native macOS harness for AI agents -- any model, persistent memory, autonomous execution, cryptographic identity. Built in Swift. Fully offline. Open source.
#30open-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).
#31op7418/CodePilot
A multi-model AI agent desktop client — connect any AI provider, extend with MCP & skills, control from your phone. Built with Electron + Next.js.
#32ax-llm/ax
The pretty much "official" DSPy framework for Typescript
#33MCPJam/inspector
Testing and evaluation platform to chat, inspect, and debug MCP servers, MCP apps, and ChatGPT apps.
#34shiwenwen/hope-agent
🦭 会记忆、能持续推进目标、会动态编排多 Agent 的跨端桌面 AI 助手，也可服务化常驻 NAS / 云端 | A cross-device desktop AI agent with memory, autonomous goals, dynamic workflows, and headless deployment
#35workweave/router
Model router for agentic systems. Routes every prompt to the right model in <50ms. Cut costs 40-70% with just an endpoint change.
#36wshobson/maverick-mcp
MaverickMCP - Personal Stock Analysis MCP Server
#37tbckr/sgpt
SGPT is a command-line tool that provides a convenient way to interact with OpenAI models, enabling users to run queries, generate shell commands and produce code directly from the terminal.
#38automagik-dev/genie
Wishes in, PRs out. CLI agent that interviews you, plans the work, dispatches parallel agents in isolated worktrees, and reviews code before you see it.
#39JSONbored/awesome-claude
HeyClaude is a curated registry and distribution surface for Claude and AI-workflow assets: agents, MCP servers, skills, commands, hooks, rules, guides, tools, jobs, Raycast feeds, static data exports, and an npm MCP package.
#40thenicolas1894/awesome-claude-fable-5-prompt-vault
Ultimate Claude Fable 5 Guide 2026: Use Cases, Integrations & Benchmarks
#41rak7777/mythic-mcp-proxy
Mythos Router 2026: Zero-Drift Local Reasoning Protocol with Adaptive Claude Opus 4.8
#42arun2990/menu-bar-token-economy
Best AI API Cost Tracker & Token Usage Monitor for Developers 2026
#43kanguruonline/claude-batchy-bulk
Slash API Batch: Cut AI Costs by 50% in 2026
#44hanyeol/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.
#45garfiec/Librechat-Mobile
Native Android & iOS client for LibreChat, built with Kotlin Multiplatform and Compose Multiplatform
#46cuihuan/awesome-ai-gateway
⚡ Awesome AI Gateway — curated comparison of 100+ AI gateways & LLM proxies (LiteLLM, OpenRouter, Portkey, Kong, Higress, new-api, Bifrost) by cost, security, compliance & self-hosting. Decision tree + reproducible benchmarks. Open source, bilingual, updated daily.