#Open Source

Matt Pocock's daily-driver agent skills for Claude Code and Codex: /grill-me to align on intent, /tdd red-green-refactor, /code-review, /diagnosing-bugs. MIT-licensed, one command to install.

Y Combinator's QM gives every employee an isolated agent sandbox, memory, and keychain — plus shared Slack channels. Swap Pi, Codex, or Claude Code. MIT.

HeyGen's open-source video framework (35k stars, Apache-2.0): deterministic MP4s from HTML/CSS and seekable animations. Ships 20 Agent Skills — product launch videos, website-to-video, PR explainers, beat-synced music videos — so one prompt lets Claude Code take a video from plan to final render.

A 28k-star GitHub template: run /clone-website <url> and your AI agent screenshots the site, extracts design tokens, writes component specs down to exact computed CSS, then dispatches parallel builders in git worktrees to reconstruct it all — as a clean Next.js 16 + shadcn codebase.

The exact Claude Code setup YC President Garry Tan uses daily, at 122k stars: 23 specialist roles plus 8 power tools that turn AI into a full engineering team — a CEO who rethinks the product, an eng manager who locks architecture, a designer who catches AI slop, a QA lead driving a real browser, a security officer running OWASP audits, and a release engineer who ships the PR. Free, MIT.

A free, MIT-licensed terminal AI SEO audit tool for Claude Code: 25 sub-skills, 18 parallel subagents, 50+ /seo commands — outputs a 0-100 health score with a prioritized action plan, replacing Ahrefs/Semrush-style subscriptions.

A Claude Code skill that makes AI follow production-grade Next.js App Router i18n patterns — translation dictionaries, clean default-locale URLs, hreflang, localized JSON-LD, and multi-language sitemaps.

An open-source (Apache-2.0) desktop design workspace that turns your own coding agent — Claude Code, Codex, Cursor, Gemini and 21+ others — into a design engine for prototypes, landing pages, dashboards, slides and HTML video. Local-first, BYOK, no vendor lock-in.