Best AI Tools open-source projects

Superpowers is a comprehensive framework that provides AI coding agents with a structured software development methodology and a suite of composable skills. It guides agents through a systematic workflow from brainstorming to code review and completion.

Anthropic's Agent Skills is a public repository of reusable skills — packaged instructions and resources that extend what an AI agent can do. It targets the Claude and broader agent ecosystem.

Langflow provides a comprehensive visual platform for developers to design, build, and deploy AI-powered agents and complex workflows. It integrates seamlessly with leading large language models and vector databases, offering flexible deployment options as APIs or MCP servers.

Firecrawl provides a comprehensive API designed for large-scale web interaction, enabling developers to search, scrape, and automate actions on websites. It transforms web content into structured, LLM-ready formats like Markdown or JSON, streamlining data acquisition for AI applications.

Dify is an open-source platform for building LLM applications and agentic workflows. It combines a visual builder, retrieval (RAG) and model management so teams can ship AI features faster.

This repository compiles system prompts, internal tools, and AI models sourced from a wide range of popular AI development platforms and agents. It serves as a valuable resource for understanding the underlying mechanics and configurations of various AI systems.

LangChain is a widely used framework for building applications and agents on top of large language models. It provides standard interfaces and a large set of integrations so you do not reinvent common plumbing.

gstack is a comprehensive toolkit of 23 opinionated AI agents and power tools, developed by Y Combinator CEO Garry Tan, designed to enable individual developers to achieve the output of a full engineering team. It integrates with Claude Code and other AI coding agents to automate various development roles.

Caveman is a Claude Code token compression skill that strips the filler from your AI coding agent's answers, so replies come back as short fragments instead of paragraphs. It installs into Claude Code, Codex, Gemini, Cursor, and 30+ other agents from one command, and keeps code, commands, and error text byte-for-byte exact. The README reports it cuts about 65% of output tokens across its own benchmark set.

Agent Reach gives your AI agent web access through a single CLI: it lets a shell-capable agent read and search Twitter, Reddit, YouTube, GitHub, Bilibili, XiaoHongShu, plain web pages and RSS, with no paid API fees for the core channels. Rather than reading sites itself, it picks, installs, health-checks and routes the upstream tools your agent calls, and `agent-reach doctor` reports which channel is live.

System Prompts Leaks is an AI system prompts collection on GitHub that gathers the extracted system prompt instructions behind popular AI products. Instead of a tool you run, it's a set of Markdown files documenting the hidden instructions attributed to Claude, ChatGPT, Gemini, Grok, Cursor, Copilot and more, organized by vendor.

CowAgent is an open-source AI assistant and agent harness (formerly chatgpt-on-wechat) that plans tasks, runs tools and skills, and maintains memory and a knowledge base across many chat channels.

Strix is an open-source AI penetration testing tool built around autonomous agents that behave like real attackers. Instead of scanning source code statically, Strix runs your app dynamically, finds vulnerabilities, and validates each one with an actual proof-of-concept exploit.

LightRAG is an open-source retrieval-augmented generation framework that adds a knowledge graph over your documents instead of relying only on flat vector similarity. It comes out of an EMNLP 2025 paper from HKUDS and ships as the `lightrag-hku` Python package.

An open-source SDK for wiring AI agents into your app's frontend — chat, generative UI, and human-in-the-loop, starting from React.

Next AI Draw.io is an open-source AI draw.io diagram generator built on Next.js. You describe a diagram in plain language in a chat panel, and it writes the draw.io XML behind the scenes — so the result opens as a normal, editable draw.io diagram, not a flat image you can't touch.

Page Agent is an open-source in-page AI GUI agent from Alibaba. You drop one JavaScript script into a web page and it gives that page its own natural-language agent — users type what they want, and the agent operates the interface for them, all inside the page.

cmux is a macOS terminal app, built on Ghostty, aimed at people running several AI coding agents in parallel. It adds vertical tabs, notification rings when an agent needs input, and a split in-app browser so you can watch agents work without hopping between windows.

Promptfoo is a command-line tool and Node library for testing LLM prompts and running security red-team scans. You describe your test cases in a config file, point it at one or more models, and get a side-by-side matrix of results instead of squinting at chat outputs by hand.

Skyvern automates browser-based workflows using vision LLMs and computer vision instead of hand-written selectors. It reads a page the way a person would, so a form-filling or data-entry flow keeps working when the site's layout shifts and an XPath script would have broken.

Desktop Commander MCP server is a Model Context Protocol server that hands Claude — and any MCP-compatible client — control of your terminal, filesystem, and code edits. It runs commands, searches and edits files with surgical diffs, and can execute Python, Node, or R in memory, all driven from a chat window instead of a separate editor.

Strix is an open-source AI penetration testing tool built around autonomous agents that behave like real attackers. Instead of scanning source code statically, Strix runs your app dynamically, finds vulnerabilities, and validates each one with an actual proof-of-concept exploit.

Langflow provides a comprehensive visual platform for developers to design, build, and deploy AI-powered agents and complex workflows. It integrates seamlessly with leading large language models and vector databases, offering flexible deployment options as APIs or MCP servers.

Firecrawl provides a comprehensive API designed for large-scale web interaction, enabling developers to search, scrape, and automate actions on websites. It transforms web content into structured, LLM-ready formats like Markdown or JSON, streamlining data acquisition for AI applications.

Superpowers is a comprehensive framework that provides AI coding agents with a structured software development methodology and a suite of composable skills. It guides agents through a systematic workflow from brainstorming to code review and completion.

Page Agent is an open-source in-page AI GUI agent from Alibaba. You drop one JavaScript script into a web page and it gives that page its own natural-language agent — users type what they want, and the agent operates the interface for them, all inside the page.

gstack is a comprehensive toolkit of 23 opinionated AI agents and power tools, developed by Y Combinator CEO Garry Tan, designed to enable individual developers to achieve the output of a full engineering team. It integrates with Claude Code and other AI coding agents to automate various development roles.

This repository compiles system prompts, internal tools, and AI models sourced from a wide range of popular AI development platforms and agents. It serves as a valuable resource for understanding the underlying mechanics and configurations of various AI systems.