Open-source projects tagged “Anthropic”.

EC

ECC

MIT

The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#JavaScriptProjects tagged with this topic in the verified catalog.8 projectsPythonProjects tagged with this topic in the verified catalog.7 projectsai-agentsProjects tagged with this topic in the verified catalog.3 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsClaudeProprietary AI assistant from Anthropic.2 alternatives

Alternatives toCClaudeCClaudeProprietary AI assistant from Anthropic.2 alternatives+2

LA

LangChain

United StatesMIT

The agent engineering platform.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsagentsProjects tagged with this topic in the verified catalog.2 projectsaiProjects tagged with this topic in the verified catalog.5 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

CA

Caveman

MIT

🪨 why use many token when few token do trick — Claude Code skill that cuts 65% of tokens by talking like caveman

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#JavaScriptProjects tagged with this topic in the verified catalog.8 projectsaiProjects tagged with this topic in the verified catalog.5 projectsanthropicProjects tagged with this topic in the verified catalog.12 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives+2

HE

headroom

Apache-2.0

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.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsagentProjects tagged with this topic in the verified catalog.1 projectaiProjects tagged with this topic in the verified catalog.5 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives+2

LI

LiteLLM

License not declared

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, Huggin

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsGithub ActionsProjects tagged with this topic in the verified catalog.4 projectsJavaScriptProjects tagged with this topic in the verified catalog.8 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsLangChainProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives

Alternatives toLLangChainLLangChainProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+4

AI

Aider

Apache-2.0

aider is AI pair programming in your terminal

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsGithub ActionsProjects tagged with this topic in the verified catalog.4 projectsJavaScriptProjects tagged with this topic in the verified catalog.8 projectsSelf-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.2 self-hosted optionsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsClaude CodeAnthropic agentic coding assistant. Viral demand includes Claude Code plugins and MCP-style tools—compare open agents…1 alternative

Alternatives toCClaude CodeCClaude CodeAnthropic agentic coding assistant. Viral demand includes Claude Code plugins and MCP-style tools—compare open agents…1 alternative+5

LI

LibreChat

United StatesMIT

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 I

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsGithub ActionsProjects tagged with this topic in the verified catalog.4 projectsJavaScriptProjects tagged with this topic in the verified catalog.8 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsClaudeProprietary AI assistant from Anthropic.2 alternatives

Alternatives toCClaudeCClaudeProprietary AI assistant from Anthropic.2 alternatives+4

9R

9Router

MIT

Unlimited FREE AI coding. Connect Claude Code, Codex, Cursor, Cline, Copilot, Antigravity to FREE Claude/GPT/Gemini via 40+ providers. Auto-fallback, RTK -40% tokens, never hit limits.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#JavaScriptProjects tagged with this topic in the verified catalog.8 projectsai-agentsProjects tagged with this topic in the verified catalog.3 projectsai-gatewayProjects tagged with this topic in the verified catalog.1 projectAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives+2

OH

oh-my-pi

MIT

⌥ AI Coding agent for the terminal — hash-anchored edits, optimized tool harness, LSP, Python, browser, subagents, and more

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsai-agentProjects tagged with this topic in the verified catalog.1 projectai-coding-agentProjects tagged with this topic in the verified catalog.1 projectAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives+2

SC

Scira

AGPL-3.0

Scira (Formerly MiniPerplx) is a minimalistic AI-powered search engine that helps you find information on the internet and cites it too. Powered by Vercel AI SDK!

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsJavaScriptProjects tagged with this topic in the verified catalog.8 projectsNodeJSProjects tagged with this topic in the verified catalog.4 projectsSelf-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.2 self-hosted optionsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsPerplexityProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives

Alternatives toPPerplexityPPerplexityProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives

AR

Arize Phoenix

License not declared

AI Observability & Evaluation

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsGithub ActionsProjects tagged with this topic in the verified catalog.4 projectsJavaScriptProjects tagged with this topic in the verified catalog.8 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsLangSmithProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative

LO

Local Deep Research

MIT

~95% on SimpleQA (e.g. Qwen3.6-27B on a 3090). Supports all local and cloud LLMs (llama.cpp, Ollama, Google, ...). 10+ search engines - arXiv, PubMed, your private documents. Everything Local & Encrypted.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.12 projects#PythonProjects tagged with this topic in the verified catalog.7 projectsacademiaProjects tagged with this topic in the verified catalog.1 projectanthropicProjects tagged with this topic in the verified catalog.12 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.12 AI-native projectsChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives

Alternatives toCChatGPTCChatGPTProprietary conversational AI assistant from OpenAI.2 alternatives+2