Open source. Open possibilities.

React Suite provides React UI components for building web applications. Supports major browsers and server-side rendering with Next.js. Includes installation via package managers and framework-specific guides.

Material Design for Bootstrap is a free UI kit offering 700+ components, themes, and templates for building responsive, mobile-first websites. Available for jQuery, Angular, React, and Vue under MIT license.

Vant is a lightweight, customizable Vue UI component library for mobile web apps, offering 80+ components with zero third-party dependencies, TypeScript support, and compatibility with Vue 2/3, Nuxt, SSR, dark mode and i18n.

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.

Vuestic Admin is an open-source admin template suite built with Vue 3, Vite, Pinia and Tailwind CSS on top of the Vuestic UI component library, offering dark theme, i18n, accessibility and responsive layouts.

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.

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.

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.

Element is a Vue.js 2.0 UI toolkit for the web, distributed on npm as element-ui. It provides reusable interface components such as Select and Button, supports full or on-demand imports, custom themes, and works in modern browsers plus Internet Explorer 10 and above.

Vuetify is an MIT-licensed Vue UI component framework offering handcrafted, responsive components with theming, SASS customization, Vite tree-shaking and 42+ language support.

Varlet is a Vue 3 component library based on Material Design 2 and 3, offering 70+ general-purpose components that work on both mobile and desktop, with theming, internationalization, SSR and TypeScript support.

Tabler is a free, MIT-licensed HTML dashboard UI kit built on Bootstrap 5, offering ready-made layouts, components and 120+ demo pages for admin panels, dashboards and web apps, with dark mode, RTL stylesheets, Sass sources and TypeScript types.

A curated awesome list of framework-level UI component libraries and design systems, organized by framework such as React, Vue, Angular, Ember, Web Components, Rails and Astro, plus special-use-case libraries, tooling, style guides and community resources.

Radix Primitives is an open-source, low-level UI component library for building accessible design systems and web apps, focused on accessibility, customization and developer experience. MIT-licensed, maintained by WorkOS.

daisyUI is a free and open-source component library for Tailwind CSS. It offers pre-designed, customizable UI components that can be used directly in HTML. The project is popular and includes extensive documentation, a component gallery, and community support.

Reka UI (formerly Radix Vue) is an open-source, accessible UI component library for Vue. It provides unstyled primitives for building high-quality design systems and web apps, with documentation, examples, and community contributions.

Nebular is a customizable Angular UI library based on the Eva Design System, offering 4 visual themes, 35+ Angular UI components, a theming engine with runtime theme switching and CSS custom properties mode, plus Eva Icons SVG support and configurable authentication strategies.