Open source. Open possibilities.

AdminLTE is an MIT-licensed, responsive admin dashboard template built on Bootstrap 5.3 with vanilla JavaScript, installable via CDN, npm or Composer, with framework editions for React, Vue, Laravel, Django and more.

Numl is a deprecated UI design language, web-component library and runtime CSS framework for quickly building interfaces that follow a design system, loadable with a single JavaScript module and no bundler or config.

Tailwind CSS is an open-source utility-first CSS framework for rapidly building custom user interfaces. The repository points to tailwindcss.com for full documentation, GitHub Discussions for community help and ideas, and contributing docs for pull requests.

A modified web browser built with Electron for responsive web development. It mirrors interactions across multiple device previews simultaneously, includes 30+ built-in device profiles, a unified elements inspector, one-click screenshots, and hot reloading. It also ships a built-in MCP server so AI coding agents can drive the app to visually verify responsive layouts.