Alex Carpenter

fast-string-width. A fast function for calculating the visual width of a string once printed to the terminal.

fast-string-truncated-width. A fast function for calculating where a string should be truncated, given an optional width limit and an ellipsis string.

amber. Save any web page as a clean, self-contained offline folder — deterministic capture, judgement by Claude

at-astro-loader. An Astro loader for ATProto data.

stableref. Proof-carrying referential stability for React and Preact

nanotags. TypeScript

agent-skills. Production-grade Agent Skills from Evil Martians — drop-in expertise for your AI coding agent

astro-pigment. Astro 6 documentation theme

datavolve. Tiny, type-safe evolutions for versioned data. Storage-agnostic, dependency-free.

obscura. The headless browser for AI agents and web scraping

nope-id. Generate Random ID with Time and Crypto

learning-cmux-with-agents. 31 natural-language prompts that prove one primary agent can stand up, drive, and tear down a whole fleet of AI coding agents and terminals inside cmux.

worktrunk. Worktrunk is a CLI for Git worktree management, designed for parallel AI agent workflows

i-input. An intelegent universal numeric input for React.

colordx-gpu. GPU companion for @colordx/core — WebGL2 gamut-slice chart rendering

clean-npm-project. Make npm packages smaller by cleaning `package.json` and popular development configs

copy-changelog-to-release. Create GitHub Releases based on latest record in `CHANGELOG.md` file

mitata. benchmark tooling that loves you ❤️

kar. Manage Karabiner config

pisolates. Shell

codiff. a fast local diff viewer

count-tokens. A simple CLI tool to count tokens in files using tiktoken

stacked-prs. Manage stacked branches and pull requests with git config metadata, Deno helper scripts, and the gh CLI.

hunk. Review-first terminal diff viewer for agentic coders

stack. TypeScript

liquid-glass-react. Apple's Liquid Glass effect for React

rosie. Agent package manager

pooleval. Eval charts for Svelte

flue. The sandbox agent framework.

pi-setup. TypeScript

cli. Put your agent in control with the Clerk CLI

sandcastle. Orchestrate sandboxed coding agents in TypeScript with sandcastle.run()

colord. 👑 A tiny yet powerful tool for high-performance color manipulations and conversions

react-colorful. 🎨 A tiny (2,8 KB) color picker component for React and Preact apps

isolet. Package any component into a self-contained, isolated widget

sql. Nano Stores wrapper around SQLite or PGLite to generate reactive stores from SQL queries

agent-skills. Production-grade engineering skills for AI coding agents.

blossom-carousel. Native-first carousel enhanced with drag support for pointer devices.

piccolore. A temporary picocolors fork

lychee-action. Github action to check for broken links in Markdown, HTML, and text files using lychee, a fast link checker written in Rust.

lychee. ⚡ Fast, async, stream-based link checker written in Rust. Finds broken URLs and mail addresses inside Markdown, HTML, reStructuredText, websites and more!

btop. A monitor of resources

agentic-design-engineering. Agentic Design Engineering — Transform generic UIs into intentional, inhabited digital places. Build + Style + Move + Write frameworks for Claude Code, Cursor, and Codex.

pretext. Fast, accurate & comprehensive text measurement & layout

markit. 🖍️ Convert anything to markdown. Mark it.

consola. 🐨 Elegant Console Logger for Node.js and Browser

cookie-es. 🍪 Cookie and Set-Cookie parser and serializer

dotfiles. My personal dotfiles

skill.color-expert. Agent skill for color science expertise. Many references covering color spaces, accessibility (APCA, WCAG), palette generation, pigment mixing, and historical color theory. Works with Claude Code, Codex, Cursor, Copilot & others.

skills. Skills for Real Engineers. Straight from my .agents directory.

stitch-sdk. Generate UI screens from text prompts and extract their HTML and screenshots programmatically.

pi-cmux. cmux integration extension for pi — sidebar status, notifications, live tool activity, workspace control. Standalone package for orchestrator and worker agents.

ccstatusline. 🚀 Beautiful highly customizable statusline for Claude Code CLI with powerline support, themes, and more.

pi-subagents. Pi extension for async subagent delegation with truncation, artifacts, and session sharing

superpowers. An agentic skills framework & software development methodology that works.

skills. Agent Skills used by the Sentry team for development.

agent-stuff. These are commands I use with agents, mostly Claude

pi-config. My personal pi coding agent configuration - skills and extensions

element-source. Get the source file location of any DOM element. Works with React, Vue, Svelte, Solid, Preact

pi-plugins. TypeScript

pi-generative-ui. Claude.ai's generative UI — reverse-engineered, rebuilt for pi. Interactive HTML/SVG widgets in native macOS windows.

compound-engineering-plugin. Official Compound Engineering plugin for Claude Code, Codex, Cursor, and more

md4x. 📄 Fast and small markdown parser and renderer

react-grab. Copy any UI element for your agent

ralph. Ralph is a suite of autonomous agents that orchestrate Claude CLI for backlog-driven SDLC automation. Each agent acts as a specialized team member, picking up tasks from your backlog based on specific criteria.

cli. Google Workspace CLI — one command-line tool for Drive, Gmail, Calendar, Sheets, Docs, Chat, Admin, and more. Dynamically built from Google Discovery Service. Includes AI agent skills.

skills. My own collection of skills for modern Node.js development

tools. Assorted useful tools, almost entirely generated using LLMs

ios-haptics. 📳 javascript library for haptic feedback inside of safari on ios

codemogger. Codemogger is a code indexing library and MCP server for AI coding agents

pi. AI agent toolkit: unified LLM API, agent loop, TUI, coding agent CLI

vinext. Vite plugin that reimplements the Next.js API surface — deploy anywhere

react-doctor. Your agent writes bad React. This catches it

mitul.ca. 🏄‍♂️ My personal portfolio website built with Next.js, Tailwind CSS and Radix Primitives

Mole. 🐹 Clean, uninstall, analyze, optimize, and monitor your Mac from the terminal.

div-phone. A phone frame React component built with Tailwind CSS classes.

agent-config. My coding agent config

errore. Errors as values for TypeScript. Fully type safe error handling.

claude-hooks. TypeScript

design-system. Home of reusable design assets and tokens for oxide internal sites

fontaine. Automatic font fallback based on font metrics

joelclaw. Personal AI operating system — blog, architecture decisions, and the journey from zero to a composable agent system.

e18e. JavaScript

charliegleason.com. A repository of projects, articles, achievements, and other information.

Handy. A free, open source, and extensible speech-to-text application that works completely offline.

product-template. TypeScript

cli. Visual testing CLI with local TDD workflow. Catch UI bugs before you commit.

pointinpoly. Exhaustively tested point-in-polygon javascript function that handles complex shapes.

astro-inspector. A Chrome DevTools extension for inspecting Astro websites and their client-side islands

agent-skills-discovery-rfc. A mechanism for discovering Agent Skills using the .well-known URI path prefix as specified in RFC 8615 for discovering Agent Skills.

tinyexec. 📟 A tiny, higher level interface around child_process

andrej-karpathy-skills. A single CLAUDE.md file to improve Claude Code behavior, derived from Andrej Karpathy's observations on LLM coding pitfalls.

torph. Dependency-free animated text component.

agent-skills. Public repository for Agent Skills

agentation. The visual feedback tool for agents.

claude-code-showcase. Comprehensive Claude Code project configuration example with hooks, skills, agents, commands, and GitHub Actions workflows

stylex-extend. An unofficial stylexjs extension

pierre. pierre’s open source code

hip-ui. TypeScript

zundo. 🍜 undo/redo middleware for zustand. <700 bytes

us-coffee-roasters. A comprehensive list of US Coffee Roasters.

icons. beautifully crafted animated icons

formisch. The lightweight, schema-first, and fully type-safe form library for React, Solid, Vue, Svelte and more.

fdir. ⚡ The fastest directory crawler & globbing library for NodeJS. Crawls 1m files in < 1s

picomatch. Blazing fast and accurate glob matcher written JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions. Used by GraphQL, Jest, Astro, Snowpack, Storybook, bulma, Serverless, fdir, Netlify, AWS Amplify, Revogrid, rollup, routify, open-wc, imba, ava, docusaurus, fast-glob, globby, chokidar, anymatch, cloudflare/miniflare, pts, and more than 5 million projects! Please follow picomatch's author: https://github.com/jonschlinkert

Stack-Sans. Stack Sans is a typeface developed for Stack Overflow.

create-context-hook. Simplify creating React Context with hooks.

agent-prism. React components for visualizing traces from AI agents

paper-mono. HTML

picocolors. The tiniest and the fastest library for terminal output formatting with ANSI colors

dither-plugin. A plugin for tailwindcss to dither things.

plop. Consistency Made Simple

reshaped. Reshaped provides accessible React and Figma components for building beautiful products or starting your own design system

ai-elements. AI Elements is a component library and custom registry built on top of shadcn/ui to help you build AI-native applications faster.

mediabunny. Pure TypeScript media toolkit for reading, writing, and converting video and audio files, directly in the browser.

neverthrow. Type-Safe Errors for JS & TypeScript

react-resizable-panels-demo-ssr. TypeScript

nstr. number → string, but looks good

c15t. The Developer-First Cookie Banner

typescript-api-extractor. Extracts API description from Typescript programs

virtua. A zero-config, fast and small (~3kB) virtual list (and grid) component for React, Vue, Solid, Svelte and Angular.

react-animatable. Tiny(~1kB) animation hooks for React, built on Web Animations API.

modern-monaco. A modern version of Monaco Editor.

happy-dom. A JavaScript implementation of a web browser without its graphical user interface

lisere. Liseré is a lightweight and composable React component for text highlighting.

spred. Simple and fast JavaScript reactive programming library.

nano_kit. An ecosystem of lightweight, modular, and performant libraries for building modern web applications, built around a push-pull based reactivity system.

simple-release-action. A simple action to release projects with monorepo support.

webawesome. Build better with Web Awesome, the open source library of web components from Font Awesome. Upgrade to Pro and ship websites faster!

zshy. 🐒 Bundler-free build tool for TypeScript libraries. Powered by tsc.

better-node-test. The CLI shortcut for node --test runner with TypeScript

legid. A library for generating safe, legit and random URL-compat IDs.

devtool-template. Free free template for dev tools

bitchat. bluetooth mesh chat, IRC vibes

remark-mark-plus. Plugin for remark to allow ==Text me== -> <mark>Text me</mark>

delaunator. An incredibly fast JavaScript library for Delaunay triangulation of 2D points

culori-scales. 🎨 Color scales for Culori

xmcp. The TypeScript MCP framework

blog. My blog

grotesk. Python

outvariant. Type-safe implementation of invariant with positionals.

playwright-persona. Authentication in Playwright using personas.

simonwillisonblog. The source code behind my blog

persistent. Smart store for Nano Stores state manager to keep data in localStorage

apcach. JS color calculator for composing colors with consistent APCA contrast ratio.

astro-themes. Easy dark mode for Astro websites

syntax-highlight-element. 👓 Syntax Highlighting using the CSS Custom Highlight API

neodrag. One Draggable to rule them all 💍

position-observer. Asynchronously observe changes in the position, size and intersection of elements without polling.

nanostores-qs. A reactive querystring manager using nanostores

livestore. LiveStore is a next-generation state management framework based on reactive SQLite and built-in sync engine.

harmonizer. TypeScript

LeaderKey. The *faster than your launcher* launcher

invariant. Type safe utilities for throwing errors (and responses) in exceptional situations in a declarative way.

zalodias. Welcome to my corner of the internet.

comlink. Comlink makes WebWorkers enjoyable.

Rag. A grotesque

unhead. The full stack <head> package for any framework.

js. JS/TS library for interfacing with Meshtastic devices

web. Meshtastic Web Client/JS Monorepo

karabiner. My Karabiner Elements configuration

oxvg. Fastest SVG toolchain for optimisation, minification, linting, and actions. Usable via CLI, Node, Wasm, or Rust.

roving-tabindex. A simple HTML web component that implements the roving tabindex pattern for building accessible menus and grids. Use it with any framework or just plain HTML!

astro-github-file-loader. Load files stored in a GitHub Repository into your Astro Content Layer

karabiner.ts. Write Karabiner-Elements configuration in TypeScript

standard-schema. A standard interface for TypeScript schema validation libraries

normy. Automatic normalization and data updates for data fetching libraries (react-query, vue-query, trpc, swr, rtk-query and more)

campsite. The Campsite monorepo

fast-grid. World's most performant DOM-based web table. Try it! fast-grid.vercel.app/

emacs-theme-gruvbox. Gruvbox is a retro groove color scheme for Emacs. Port of the Vim version.

shadcn-registry-template. Template repository for building a custom component registry for shadcn/ui

sitefetch. Fetch an entire site and save it as a text file (to be used with AI models).

astro-starlight-remark-asides. JavaScript

core. An Emacs framework for the stubborn martian hacker

Chicago-Kare. A Faithful Reproduction of the Bitmap Version of the Chicago Typeface Created by Susan Kare for Apple Computer in 1984

play.core. ASCII Playground

react-complex-tree. Unopinionated Accessible Tree Component with Multi-Select and Drag-And-Drop

svg-rounded-donut. Given an angle returns a donut sector with rounded corners

blendy. 🧈 Smoothly transition one element into another with just a few lines of code.

glasstty. GlassTTY: TrueType VT220 font

react-scan. Scan and fix React performance issues

react-activity-calendar. React component for displaying activity data in a calendar (heatmap)

clean-publish. Removing configuration files and fields in package.json before publishing to npm

gruvbox-contrib. Ports of the gruvbox colorscheme

dotfiles. Go Template

culori. A comprehensive color library for JavaScript.

tinyglobby. A fast and minimal alternative to globby and fast-glob

tailwindcss-motion. tailwindcss-motion is a Tailwind CSS Plugin made at RomboHQ. It’s a simple, yet powerful, animation library with a simple syntax.

toldo. An elevated dialog component for React.

todoctor. 🐍 CLI tool to analyze and report TODO comments in JavaScript and TypeScript Git repositories

react-polymorphed. A set of types to help easily create fast polymorphic components.

bluesky-flutterby. An Animated svg icon for your Bluesky profile link

rosetta. A general purpose internationalization library in 292 bytes

use-stick-to-bottom. A lightweight React Hook intended mainly for AI chat applications, for smoothly sticking to bottom of messages

color. modern color library for image processing and creative coding (oklab, xyz, p3, rec2020 + more)

clack. Effortlessly build beautiful command-line apps

NextFaster. A highly performant e-commerce template using Next.js

nanoform. TypeScript

router. A tiny (673 bytes) router for Nano Stores state manager

sylph. A minimal portfolio template.