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.
Biome is a fast formatter for JavaScript, TypeScript, JSX, TSX, JSON, HTML, CSS and GraphQL that scores 97% compatibility with Prettier (see known limitations), saving CI and developer time.
Biome can even format malformed code as you write it in your favorite editor.
Semble is a code search library built for agents. It returns the exact code snippets they need instantly, using ~98% fewer tokens than grep+read. Indexing and searching a full codebase end-to-end takes under a second, with ~200x faster indexing and ~10x faster queries than a code-specialized transformer, at 99% of its retrieval quality (see benchmarks). Everything runs on CPU with no API keys, GPU, or external services.
Agent harness
Production-grade engineering skills for AI coding agents.
Skills encode the workflows, quality gates, and best practices that senior engineers use when building software. These ones are packaged so AI agents follow them consistently across every phase of development.
Run a team of coding agents on your Mac.
Create parallel Codex + Claude Code agents in isolated workspaces. See at a glance what they're working on, then review and merge their changes.
A light-weight and powerful meta-prompting, context engineering and spec-driven development system for Claude Code, OpenCode, Gemini CLI, Kilo, Codex, Copilot, Cursor, Windsurf, Antigravity, Augment, Trae, Qwen Code, Cline, and CodeBuddy.
An open source toolkit that allows you to focus on product scenarios and predictable outcomes instead of vibe coding every piece from scratch.
The Zero-Server Code Intelligence Engine - GitNexus is a client-side knowledge graph creator that runs entirely in your browser. Drop in a GitHub repo or ZIP file, and get an interactive knowledge graph wit a built in Graph RAG Agent.
Penpot is the first open-source design tool for design and code collaboration. Designers can create stunning designs, interactive prototypes, design systems at scale, while developers enjoy ready-to-use code and make their workflow easy and fast. And all of this with no handoff drama.
Available on browser or self-hosted, Penpot works with open standards like SVG, CSS, HTML and JSON, and it’s free!
Val Town is a social website to write and run code. Vals are small JavaScript/TypeScript snippets that run on their servers. You can create APIs, scheduled functions, email yourself, and persist small pieces of data — all from the browser.
AutoPR is a GitHub Action that autonomously writes pull requests in response to issues with ChatGPT.
Denigma explains code in conversational English.
Powered by machine learning.
Tabnine is an AI-powered code completion extension for IDEs
With GitHub Copilot, get suggestions for whole lines or entire functions right inside your editor.
Quicktype generates types and helper code for reading JSON in C#, Swift, JavaScript, Flow, Python, TypeScript, Go, Rust, Objective-C, Kotlin, C++ and more. Customize online with advanced options, or download a command-line tool.
Resources to facilitate coding katas
semgrep is a tool for easily detecting and preventing bugs and anti-patterns in your codebase. It combines the convenience of grep with the correctness of syntactical and semantic search. Developers, DevOps engineers, and security engineers use semgrep to write code with confidence.
Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary.
A source code analyzer built for surfacing features of interest and other characteristics to answer the question 'what's in it' using static analysis with a json based rules engine. Ideal for scanning components before use or detecting feature level changes.