Pigment CSS is a zero-runtime CSS-in-JS library that extracts the colocated styles to their own CSS files at build time.

Base UI is an open-source library of accessible, unstyled UI components for React.

StyleX is the styling system for ambitious user interfaces.

Hook into advanced CSS features from native inline styles.

Radix Themes is an open-source component library optimized for fast development, easy maintenance, and accessibility. Maintained by @workos.

Utilities and variants for styling Radix state

[Not Actively Maintained] CSS-in-JS with near-zero runtime, SSR, multi-variant support, and a best-in-class developer experience.

CSS custom properties to help accelerate adaptive and consistent design.

General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.

whiteboard / infinite canvas SDK

A best-practices CSS foundation

A collection of meaningful properties and functional classes designed to help you write cleaner, scalable, and easier to maintain CSS

Supabase UI Library

A few methods of measuring CSS-in-JS performance

🍷 Responsive, unstyled UI primitives for React Native Web.

Oathello Laravel package

Rich editor and blog system

Determine if a browser event was caused by mouse, touch or key input.

An extremely fast bundler for the web

Tailwind inspired tools to build fast with Stitches

Determine responsive traits to only server-side render markup truly needed.

CSS media queries in react - for responsive design, and more.

Use env() variables in CSS

A design system for building faithful recreations of old UIs

A gorgeous, accessible color system.

Documentation site for System Props

Responsive, theme-based style props for building design systems with React. Written in TypeScript.

Website and documentation for Radix.