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Top 23 anthropic Open-Source Projects
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Project mention: Scarab Diagnostic Suite Field Test #011: LangChain Structured Output Streaming Boundary | dev.to | 2026-06-04
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caveman
🪨 why use many token when few token do trick — Claude Code skill that cuts 65% of tokens by talking like caveman
Project mention: Stop Paying for Noise: Trim LLM Tokens from Both Ends of the Pipe | dev.to | 2026-05-27If RTK handles the flood of input tokens, caveman disciplines the output. It is a Claude Code skill that instructs the model to respond with minimal words. The caveman repository states it “cuts 65% of tokens by talking like caveman.”
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oh-my-openagent
omo; the one and only agent harness for complex codebases. the pickaxe for complex software engineering. For your Codex, for your OpenCode
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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]
— Getting Started
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Project mention: Microsoft pulled internal Claude Code licenses — what their engineers' preference tells you about picking AI tools | dev.to | 2026-06-06
Aider with a bring-your-own API key has no subscription floor. Pay per token. For 2-3 focused hours per week, costs less than $20/mo. For full-time use, costs more than Max. Best for terminal natives who already live in tmux and do not want a separate IDE.
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awesome-claude-code
A curated list of awesome skills, hooks, slash-commands, agent orchestrators, applications, and plugins for Claude Code by Anthropic
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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system_prompts_leaks
Extracted system prompts from Anthropic - Claude Code, Claude Design, Opus 4.8, Sonnet 4.6. OpenAI - ChatGPT 5.5 Thinking, GPT 5.5 Instant, Codex, Google - Gemini - 3.5 Flash, 3.1 Pro, Antigravity, xAI - Grok, Cursor, Copilot, VS Code, Perplexity, and more. Updated regularly.
Project mention: System_prompts_leaks: Anthropic/Claude-Opus-4.6.md | news.ycombinator.com | 2026-04-06 -
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.
Several services share the same Ollama instance on a dedicated host that homelab-agent is provisioning: LibreChat for interactive chat, a SearXNG MCP server for ML-reranked search, and three background embedding jobs — graphiti, jobsearch-mcp, and memsearch-watch.
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agents
Multi-harness agentic plugin marketplace for Claude Code, Codex CLI, Cursor, OpenCode, and Gemini CLI
Project mention: Repository Transformation: From Chaos to Professional Prompt Engineering Toolkit | dev.to | 2026-03-25Prominently featured 74 professional AI agent configurations adapted from wshobson/agents:
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sim
Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.
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.
Most people paste files one at a time. Install Repomix and feed your entire project to the AI in one command.
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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
Project mention: Vercel AI Gateway Appears to Block BYOK Requests When Account Balance Reaches $0 | news.ycombinator.com | 2026-06-01 -
claude-hud
A Claude Code plugin that shows what's happening - context usage, active tools, running agents, and todo progress
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career-ops
AI-powered job search system built on Claude Code. 14 skill modes, Go dashboard, PDF generation, batch processing.
Last month I found career-ops by Santiago Ferreira — a Claude Code-native job search system with a Go-based TUI dashboard, portal scanners, batch evaluation, and an interview story bank. It does everything Rendure did, plus most of the job search workflow Rendure never touched. I forked it, plugged my own pipeline pieces into the parts that didn't fit me, and moved on.
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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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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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dyad
Local, open-source AI app builder for power users ✨ v0 / Lovable / Replit / Bolt alternative 🌟 Star if you like it!
Project mention: Vibe coded Lovable-hosted app littered with basic flaws exposed 18K users | news.ycombinator.com | 2026-02-27One dev of a Lovable competitor pointed me to the rules thats supposed to ensure queries are limited to that user's data. This seems like "pretty please?" to my amateur eyes.
https://github.com/dyad-sh/dyad/blob/de2cc2b48f2c8bfa401608c...
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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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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
A solo founder using Bolt or Lovable can go from idea to working prototype in a weekend. Cursor handles multi-file refactoring on a production codebase. v0 generates polished UI components from a description. The founder who previously needed six months and $80,000 in savings or seed funding can now ship a testable product in two weeks for under $8,000 in tool costs.
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Project mention: I Don’t Make Slides Anymore. My Agent and Entire Do It for Me. | dev.to | 2026-04-25
I've looked for a way to automate slide generation, but most options have been fragile. They generally struggle with formatting and taste. However, a few months ago, some of my teammates at Block discovered the frontend slides skill and introduced me to it. This skill enables agents to build out HTML presentation decks that can be exported as PDFs or PowerPoint presentations.
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WrenAI
Give AI agents the context to query business data correctly through the open context layer that gives AI agents grounded, governed memory, context, SQL across 20+ data sources, that helps you build agentic GenBI, text-to-sql, dashboards, and agentic analytics.
Project mention: Revolutionize Your Data Workflow with Wren AI: The Open-Source GenBI Agent | dev.to | 2025-09-01View the Project on GitHub
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awesome-claude-skills
A curated list of awesome Claude Skills, resources, and tools for customizing Claude AI workflows — particularly Claude Code (by travisvn)
Project mention: How to Write Workflow Skills: Patterns and Best Practices Distilled from 7 Top Projects | dev.to | 2026-04-28[17] travisvn/awesome-claude-skills: https://github.com/travisvn/awesome-claude-skills
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).
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Jun 2026
Index
What are some of the best open-source anthropic projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | langchain | 138,635 |
| 2 | caveman | 68,367 |
| 3 | oh-my-openagent | 60,999 |
| 4 | litellm | 49,432 |
| 5 | aider | 45,826 |
| 6 | awesome-claude-code | 45,612 |
| 7 | system_prompts_leaks | 41,269 |
| 8 | LibreChat | 38,208 |
| 9 | agents | 36,406 |
| 10 | sim | 28,708 |
| 11 | claude-code-templates | 27,792 |
| 12 | repomix | 25,919 |
| 13 | ai | 24,695 |
| 14 | claude-hud | 24,546 |
| 15 | career-ops | 24,191 |
| 16 | opcode | 21,993 |
| 17 | Happy Coder | 21,638 |
| 18 | dyad | 20,516 |
| 19 | pentagi | 17,428 |
| 20 | bolt.new | 16,245 |
| 21 | frontend-slides | 15,613 |
| 22 | WrenAI | 15,453 |
| 23 | awesome-claude-skills | 13,164 |
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