Open source. Open possibilities.

An imperative Swift 6 wrapper for GTK4 and libadwaita, offering 178 type-safe widget wrappers, fluent setters, async/await, and full GNOME desktop app support on Linux and macOS.

CompoMo (@ds-mo/ui) is a framework-agnostic Stencil.js web component library styled with TokoMo design tokens, shipping generated Angular, React and Vue adapters alongside an MCP metadata server.

A collection of 120 plain-text DESIGN.md brand design specifications reverse engineered from live production sites, letting AI coding agents generate on-brand UI. Each brand includes real colors, typography, components and guardrails plus a self-contained preview.html.

Naive UI is a Vue 3 component library with over 90 tree-shakable components, written in TypeScript. It offers a type-safe theme system for customization without CSS imports, and data components use virtual lists by default for speed.

Tailgrids is an open-source React UI component library built with Tailwind CSS, offering 100+ production-ready copy-paste components plus UI blocks and templates, with TypeScript support, accessibility, dark mode and a CLI installer.

Chakra UI is an open-source React component system for building accessible web apps and SaaS products quickly. It ships installable component packages, supports Next.js RSC, and is MIT licensed.

TW Elements is an MIT-licensed component library for Tailwind CSS, offering 500+ interactive UI components and 117+ design blocks with dark mode support, theming options, and quick installation for personal and commercial use.

Radix Themes is an open-source React component library focused on fast development, easy maintenance and accessibility, maintained by WorkOS. The README points to full documentation, release notes, contributor guidelines, community channels and its MIT license.

Sparkle is an experimental TypeScript playground monorepo using Turborepo and pnpm. It bundles a cross-platform design system, accessible React component library, Expo mobile app, WASM web shell with Zig executables, Storybook, and Astro Starlight docs.

MudBlazor is a Material Design component framework for Blazor, written entirely in C# with minimal JavaScript. It helps .NET developers build web apps quickly without wrestling with CSS, and offers documentation, examples and frequent releases.

PlayCanvas PCUI is an MIT-licensed UI component library for web tools, offering fully styled components, React wrappers, observer-based data binding, Storybook examples, font theming, and UMD bundle support.

Zag provides headless, framework-agnostic state machines for accessible JavaScript UI components, with adapters for React, Solid, Vue and Svelte and unstyled APIs for building your own design system.

ZenUI Library React is an open-source UI component library built with React and Tailwind CSS. It offers 800+ components, 20+ templates, 100+ animated components, 500+ icons and color tools, and is used by copying code snippets into your project.

Vuestic UI is an MIT-licensed Vue 3 component library from Epicmax, offering accessible UI components, documentation, Nuxt and Tailwind integrations, and a CLI scaffold command for quick project setup.

Ant Design is an enterprise-class UI design language and React component library written in TypeScript, offering ready-to-use quality components, design resources, theming and internationalization.

Codex is the design system for Wikimedia, offering Vue 3 and CSS components, design tokens, icons, and a VitePress documentation site. It supports internationalization and meets WCAG 2.1 AA accessibility standards.

theme61 is an R package for creating graphs that follow the e61 Institute style. It provides functions to make aesthetic graphs and offers easy access to the Institute's colour palette, with documentation available on its package website.

Mirotone React is a component library for the Mirotone Design System, providing a set of React components and utilities to accelerate development for Miro.

Cloudscape Design System's React component library, open-sourced by AWS. Provides accessible, ready-made UI components and global styles for building large-scale web applications, with documentation on the Cloudscape website.

Cult UI is an MIT-licensed collection of accessible, customizable components styled with Tailwind CSS and compatible with shadcn. It emphasizes copy-and-paste integration and also bundles AI agent patterns, premium blocks, and starter templates.