- tailwindcss by tailwindlabs, 99k stars. Utility-first CSS framework
- responsively-app by responsively-org, 26k stars. Browser for checking how web pages render at different screen sizes
- next-themes by pacocoursey, 6.4k stars. Dark mode and theme switching for Next.js apps with no flash on load
- scroll-craft by nateherkai, 5.1k stars. Agent skill for building scroll-driven, animated websites
- taffy by DioxusLabs, 3.8k stars. Flexbox and CSS grid layout engine written in Rust
- lint by shadcn-ui, 3.4k stars. Linter for Tailwind design systems with rules that agents can verify
- oil-motion by oil-oil, 2.9k stars. Agent skill that writes scroll and mouse-driven web animations
- webtui by webtui, 2.5k stars. CSS library that styles web pages like terminal user interfaces
- cn by shadcn-ui, 1.8k stars. Tailwind class merging library that replaces tailwind-merge and clsx
- reanimate by NiazMorshed2007, 1.7k stars. Claude skill that copies an animation frame by frame and checks the result
- polycss by layoutit, 772 stars. CSS-only 3D engine that renders polygon meshes in the DOM via matrix3d
- blades by anyblades, 488 stars. Fork of Pico CSS that drops in as a classless stylesheet with the same variables
- quickLiquid by amarnath3003, 383 stars. Optimized Liquid Glass visual effect for web interfaces
- Sumi.css by vladocar, 231 stars. Minimal CSS framework that works mostly without classes
- css-web-ui-demos by GoogleChromeLabs, 183 stars. Collection of CSS and web UI demos
- loadersz-core by lumberjacque, 165 stars. Framework-agnostic canvas loading animations packaged as a web component
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