CSS Frameworks

Explore 261 open source projects in CSS Frameworks

Showing 1-20 of 261 projects

twbs/bootstrap

Popular frontend framework for responsive web design

174.0K

Active

MDX

CSS Frameworks

Bootstrap

#bootstrap#css-framework#html

tailwindlabs/tailwindcss

Utility-first CSS framework for rapid UI development

93.9K

Active

TypeScript

CSS Frameworks

Tailwind CSS

#css#tailwindcss#utility-first

necolas/normalize.css

Normalize.css is a modern CSS reset alternative that normalizes styles across browsers.

53.8K

Archived

CSS

CSS Frameworks

#css#normalize#reset

Semantic-Org/Semantic-UI

Semantic UI, a CSS framework for building responsive and accessible user interfaces.

51.1K

Archived

JavaScript

Component Libraries (React)

CSS Frameworks

Semantic-UI

#semantic-ui#css-framework#react-component-library

jgthms/bulma

Modern CSS framework based on Flexbox

50.1K

Active

CSS

CSS Frameworks

#css#flexbox#framework

Dogfalo/materialize

CSS framework based on Material Design for creating responsive websites

39.1K

Experimental

JavaScript

CSS Frameworks

Material Design

#css#material-design#framework

postcss/postcss

Transforming styles with JS plugins

29.0K

Stable

TypeScript

LLM Frameworks

CSS Frameworks

PostCSS

#postcss#javascript#css

pure-css/pure

Responsive CSS modules for web projects

23.8K

Active

JavaScript

CSS Frameworks

#css#responsive#modules

nostalgic-css/NES.css

8-bit styled CSS framework for retro UI design

21.7K

Archived

SCSS

CSS Frameworks

#8bit#css#nes

chokcoco/iCSS

CSS tricks and animations repository for creative web design solutions

20.7K

Stable

JavaScript

Animation & Motion

CSS Frameworks

#css#css3#web-animations

dhg/Skeleton

Skeleton is a lightweight, responsive CSS framework for mobile-friendly web development.

19.8K

Archived

CSS

CSS Frameworks

#css#responsive#boilerplate

unocss/unocss

An instant on-demand atomic CSS engine that helps developers build fast, responsive, and customizable user interfaces.

18.7K

Active

TypeScript

CSS Frameworks

Vite

#atomic-css#utility-first-css#css-framework

less/less.js

less.js is a dynamic stylesheet language that compiles to CSS, providing a more powerful and flexible way to write styles.

17.1K

Active

JavaScript

CSS Frameworks

React

#css#stylesheet#language

aniftyco/awesome-tailwindcss

A curated list of awesome resources related to the Tailwind CSS utility-first CSS framework.

14.9K

Stable

CSS Frameworks

Tailwind

#tailwind#css#postcss

tachyons-css/tachyons

Tachyons is a functional CSS framework that provides a modular and scalable way to build responsive designs.

11.7K

Active

CSS

CSS Frameworks

React

#css#design-patterns#design-systems

stylelint/stylelint

A powerful CSS linter that helps developers enforce coding conventions and avoid errors.

11.4K

Active

JavaScript

CSS Frameworks

React

#css#linter#style-guide

stylus/stylus

Stylus is an expressive, robust, feature-rich CSS preprocessor language built for Node.js.

11.3K

Experimental

JavaScript

CSS Frameworks

Node

#css#preprocessor#styl

troxler/awesome-css-frameworks

A curated list of awesome CSS frameworks and tools for developers in 2025.

9.2K

Stable

CSS

Component Libraries (React)

CSS Frameworks

React

#css#scss#frameworks

themesberg/flowbite

Open-source UI component library and front-end development framework based on Tailwind CSS

9.1K

Stable

HTML

Component Libraries (React)

UI Component Libraries

React

#components#css#tailwind

thoughtbot/bourbon

Bourbon is a lightweight Sass tool set that provides a collection of mixins, functions, and more for building stylesheets.

9.0K

Archived

Ruby

CSS Frameworks

React

#css#sass#scss

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