Open source. Open possibilities.

A React port of GitLab's Pajamas Design System component library, offering design tokens, foundational styles and basic components like GlButton, GlLink, GlBadge and GlCard. Still under heavy development.

shadcn/ui is an open-source collection of customizable, accessible UI components distributed through a code distribution platform, intended as a starting point for building your own component library and compatible with popular frameworks.

Base UI is an unstyled UI component library from the creators of Radix, Floating UI, and Material UI. It helps developers build accessible web apps and design systems with customizable, unstyled components.

Appica UI is an MIT-licensed monorepo of themeable UI components for modern web apps. It currently ships @appica/ui-react, offering 70+ accessible components with polished interactions, dark mode and full theming, plus a matching Figma design file.

coss.com/ui is the official design system of Cal.com — a TypeScript monorepo of React components built on Base UI and styled with Tailwind CSS, intended to be copied, pasted and owned, alongside the docs site and a legacy Origin UI snapshot.