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Top 23 anthropic Open-Source Projects
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LangChain helps you build applications with large language models (LLMs).
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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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.
Four repos on today's GitHub Trending tell you everything you need to know about where the money is moving. agency-agents — a bundle of agent persona templates — sits at 157,000 stars. caveman — a proxy that makes coding agents talk in compressed fragments to cut token costs 65% — has 110,000. claude-mem — persistent memory that follows agents between sessions — just crossed 96,500. Agent-Reach — one CLI that gives agents eyes on Twitter, Reddit, YouTube, and GitHub with zero API fees — is pulling 1,156 new stars per day.
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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.
Project mention: Headroom: Save Tokens from Reversible Compression | news.ycombinator.com | 2026-09-04 -
oh-my-openagent
OmO: Just type "mass ulw" keyword with your prompt. Now you are the master of graph engineering.
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system_prompts_leaks
Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro, Antigravity. xAI - Grok, Grok Bot, Cursor, Kimi and more! Updated regularly.
Project mention: What AI Chatbots Are Told Before You Type: A Developer's Guide to the system_prompts | dev.to | 2026-09-15git clone https://github.com/asgeirtj/system_prompts_leaks.git cd system_prompts_leaks # See how different products talk about tool usage grep -ril "tool" --include="*.md" . | head -20 # Compare formatting rules across vendors grep -ri "markdown" --include="*.md" . | less
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litellm
The fastest, litest AI Gateway. Rust core with Python SDK. Call 100+ LLM APIs in OpenAI (or native) format with cost tracking, guardrails, load balancing, and logging [Bedrock, Azure, OpenAI, Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM]
Project mention: In-App Chatbot API: Nodejs Context Windows and JSON Portability | dev.to | 2026-10-05 -
awesome-claude-code
A hand-picked collection of the finest of resources for the most awesome of agents, Claude Code, the undisputed champion of coding companions, from the unstoppable team at Anthropic PBC. A delectable showcase of top tier skills, ambidextrous agents, scintillating status lines, top notch developer tooling, and also we have plugins
Project mention: Put your Coding Agents in Drive w/ Superpowers (aka How Superpowers is the Automatic Transmission of Agentic Coding) | dev.to | 2026-05-28The most downloaded and widely used methodology in the Claude Code ecosystem is Superpowers, with over 208k stars⭐️ and 18.5k forks🍴 on GitHub (and counting!)
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SaaSHub
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Project mention: 5 Practical AI Coding Tricks Learned from Top GitHub Trending Agents | dev.to | 2026-09-28
If you’ve watched GitHub Trending over the past month, one shift is impossible to ignore: AI coding has moved from simple code completion to autonomous terminal agents like Aider, Cline, and Claude Code.
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LibreChat
Enhanced ChatGPT Clone: Features Agents, MCP, Skills, 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
Project mention: Running a Local LLM on an Older Computer: A Simple Home Lab Guide | dev.to | 2026-09-03Tools such as Open WebUI, LibreChat, and AnythingLLM can connect to Ollama and provide a browser-based chat interface.
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agents
Multi-harness agentic plugin marketplace for Claude Code, Codex, Cursor, OpenCode, GitHub Copilot, Google Antigravity, and Pi
Project mention: Skills Sprawl: When Too Much of a Good Thing Confuses Your AI Agent | dev.to | 2026-08-17Specialised & Community Skills: Niche skills sourced from specific community repositories, including wshobson/agents (documentation-and-adrs, interview-me), coreyhaines31/marketingskills (seo-audit), remotion-dev/skills (remotion-best-practices), and vercel-labs/skills (find-skills).
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Project mention: The vendor documents this bug. A 30k-star repo shipped it anyway. | dev.to | 2026-08-04
This one points the other way. The target is claude-code-templates — 30.1k stars, 3.3k forks, the largest Claude Code template repo — and its analytics over-counted my tokens by 2.35×.
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sim
Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders.
Sim ai is an alternative to Heym
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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.
Project mention: One console.log disconnects your MCP server: the stdout bug every stdio server author hits | dev.to | 2026-09-27Real examples: esp-idf#19087, repomix#1866, keycloak-mcp#6.
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claude-hud
A Claude Code plugin that shows what's happening - context usage, active tools, running agents, and todo progress
Project mention: Maximizing the value of your Claude Code sessions | news.ycombinator.com | 2026-08-14it's easy to create one, or use something like https://github.com/jarrodwatts/claude-hud
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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
If you’re a JavaScript or TypeScript developer, Vercel AI SDK can help you add AI features to your web apps.
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Project mention: Current Frontline in AI Agent Development: Robust Agent Design and Security Measures | dev.to | 2026-03-23
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career-ops
AI-powered job search system built on Claude Code. 14 skill modes, Go dashboard, PDF generation, batch processing.
Project mention: The Sad State of SWE Resumes (and How to Actually Land a Job in 2026) | dev.to | 2026-07-21There's actually a repo which helps you with this. Be truthful, but don't hesitate to use technology, and that's exactly what it does: https://github.com/santifer/career-ops
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Happy Coder
Mobile and Web client for Claude Code. Spawn and control multiple Claude Codes in parallel. Happy Coder runs on your hardware. Works seamlessly with your existing tools and workflow. Secure with end-to-end encryption. Hands-free control with voice agent - not just dictation.
Project mention: Happy — The Open-Source App That Puts Claude Code in Your Pocket | dev.to | 2026-04-15Code on GitHub. Live app at happy.engineering. More posts at radarlog.kr.
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opcode
A powerful GUI app and Toolkit for Claude Code - Create custom agents, manage interactive Claude Code sessions, run secure background agents, and more.
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dyad
Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!
really excited to see this release! i've been using TypeScript for several projects like https://github.com/dyad-sh/dyad which is >250k lines of TypeScript and the speed-up makes things like running typescript check as a pre-commit hook painless
thanks DanRosenwasser and team for building such an awesome tool for so many years!
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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.
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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
Project mention: Proxy for OpenAI Codex and Claude Code, use any LLM with those apps | news.ycombinator.com | 2026-07-22 -
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.
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SaaSHub
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
anthropic discussion
anthropic related posts
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Beyond First-Order Reasoning: Why LLM Strategies Fail Under Pressure
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Show HN: Codex and Claude subscriptions pooled together with whoever you trust
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In-App Chatbot API: Nodejs Context Windows and JSON Portability
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Bridging the Gap Between AI Reasoning and Physical Facility Constraints
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A request limit cannot cap your LLM bill. Reserve tokens in Redis
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Show HN: Draw from your friends' Claude quota
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Caveman: Make Your AI Coding Agent Talk Less (and Save Tokens)
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Oct 2026
Index
What are some of the best open-source anthropic projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | langchain | 147,425 |
| 2 | caveman | 108,610 |
| 3 | headroom | 74,438 |
| 4 | oh-my-openagent | 69,743 |
| 5 | system_prompts_leaks | 68,770 |
| 6 | litellm | 60,094 |
| 7 | awesome-claude-code | 54,860 |
| 8 | aider | 49,369 |
| 9 | LibreChat | 45,213 |
| 10 | agents | 40,180 |
| 11 | claude-code-templates | 32,362 |
| 12 | sim | 29,778 |
| 13 | repomix | 28,619 |
| 14 | claude-hud | 28,277 |
| 15 | ai | 27,118 |
| 16 | pentagi | 25,162 |
| 17 | career-ops | 24,191 |
| 18 | Happy Coder | 23,999 |
| 19 | opcode | 22,415 |
| 20 | dyad | 21,632 |
| 21 | WrenAI | 17,799 |
| 22 | opencodex | 16,959 |
| 23 | ai-berkshire | 16,614 |
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