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Simple, but solid patterns for responsive HTML email templates and newsletters. Even in Outlook and Gmail.

  • responsive-email
  • html-email
  • newsletter
  • email

Extract any website's complete design system with one command. DTCG tokens, semantic+primitive+composite, MCP server for Claude Code/Cursor/Windsurf, multi-platform emitters (iOS SwiftUI, Android Compose, Flutter, WordPress), Tailwind v4, Figma variables, shadcn/ui, CSS health audit, WCAG remediation, Chrome extension. MIT, Playwright, Node 20+.

Automate the creation of a lab environment complete with security tooling and logging best practices

  • vagrant
  • vagrantfile
  • packer
  • information-security

Programmatic video for coding agents — HTML to video on your laptop. Turn HTML, CSS & data into real MP4s with pluggable render engines, 21 templates, AI soundtrack. Apache-2.0, no per-render fees. An official project by the Open Design team.

Robust, fast, scalable, and sandboxed open-source online code execution system for humans and AI.

  • online-judge
  • online-compiler
  • competitive-programming
  • code-executor