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THE FIRST COLLECTIONBootstrap is a widely used open-source front-end framework for building responsive, mobile-first websites. It provides compiled and source CSS, JavaScript components, utility classes, and theming tools, with options for install via npm, Composer, NuGet and more.
Tailwind CSS is an open-source utility-first CSS framework for rapidly building custom user interfaces. The repository points to tailwindcss.com for full documentation, GitHub Discussions for community help and ideas, and contributing docs for pull requests.
Oruga is a lightweight Vue.js 3 UI component library with no CSS framework dependency. It provides customizable components, tree-shaking, themes, and class-mapping configuration for integrating Tailwind, Bulma, Bootstrap, or custom styles.
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.
Materialize is a modern CSS framework based on Material Design principles, providing a set of tools to create responsive and visually consistent user interfaces.
Oat is an ultra-lightweight, zero-dependency semantic HTML/CSS/JS UI library (~10KB min+gz). It needs no framework or build step, styles semantic tags contextually without classes, and uses minimal JS WebComponents for dynamic parts.
Bulma is a modern, Flexbox-based CSS framework distributed as a single CSS file with no JavaScript. It offers Sass sources for variable customization and works with any frontend stack.
Numl is a deprecated UI design language, web-component library and runtime CSS framework for quickly building interfaces that follow a design system, loadable with a single JavaScript module and no bundler or config.
Spruce CSS is an open-source, lightweight Sass-based CSS design system and framework offering variables, mixins, functions, few utility classes and CSS custom property theming with dark mode.
A lightweight, modular and customizable design system built with vanilla CSS, using CSS variables, mobile-first responsive principles and accessibility practices. It includes examples, design tokens, build and lint scripts, format conversion, and a CDN-ready combined CSS file.
