284 Open Source CSS Framework Software Projects

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

Semantic is a UI component framework based around useful principles from natural language.

Modern CSS framework based on Flexbox

Materialize, a CSS Framework based on Material Design

A utility-first CSS framework for rapid UI development.

NES-style CSS Framework | ファミコン風CSSフレームワーク

Themes for Bootstrap

An extended table to integration with some of the most widely used CSS frameworks. (Supports Bootstrap, Semantic UI, Bulma, Material Design, Foundation, Vue.js)

Spectre.css - A Lightweight, Responsive and Modern CSS Framework

A minimalist CSS framework.

A drop-in collection of CSS styles to make simple websites just a little nicer

Lightweight CSS framework

Modern framework to print the web correctly.                                               

A useful list of must-watch talks about CSS

List of awesome CSS frameworks in 2022

CSS only library to fill empty background with beautiful patterns.

A minimal, responsive, style-agnostic CSS framework!

A collection of best front-end frameworks for faster and easier web development.

:cherry_blossom: a minimal css framework/theme.

A lightweight, scalable, mobile-first CSS framework

This repository contains content which will be helpful in your journey as a front-end Web Developer

Fomantic-UI is a community fork of Semantic-UI

A little bag of CSS superpowers, built on PostCSS

World's smallest responsive 🔥 css framework (395 bytes)

CSS framework for dummies, without a single CSS class

Propeller - Develop more, Code less. Propeller is a front-end responsive framework based on Google's Material Design Standards & Bootstrap.

A starter CSS framework that actually looks good.

Drop-in switcher for previewing minimal CSS frameworks

Bojler is an email framework

⛏️ ‎ A front-end design toolkit for developing web apps.

A modular, “mobile-first” CSS framework built with performance and scalability in mind.

CSS-in-JS with near-zero runtime, SSR, multi-variant support, and a best-in-class developer experience.

Universal CSS for web printing

The minimal CSS toolkit for flat and clean designs

NHS.UK frontend contains the code you need to start building user interfaces for NHS websites and services.

AgileJS - The Css3 Creation Engine 🍖🌭🍔

A production-ready theme for your projects with a minimal style guide https://evie.undraw.co

:cloud: The SCSS framework for the modern web.

From community websites to web applications, this CSS framework will help you achieve a consistent look and feel.

🔌 Convert Bootstrap CSS code to Tailwind CSS code

RTL edition of bootstrap v4 for rtl languages like Farsi and Arabic

Baseline atomic CSS toolkit.

🎮 PS1 style CSS Framework, inspired by NES.css

Sass library to make isometric 2D without javascript

A modern CSS framework — versatile, well documented.

An open-source design system for building scalable, responsive websites and applications.

Scally is a Sass-based, BEM, OOCSS, responsive-ready, CSS framework that provides you with a solid foundation for building reusable UI's quickly 🕶

SMART CSS GRID - CSS Framework

Pavilion CSS Framework. A solid starting point without the bloat.

Library with missing Functional / Atomic CSS classes for Bulma framework

A simple colorful CSS framework

Frontend boilerplate and framework based on gulp, pug, stylus and babel

Utility based css framework built with SCSS.

A Utility Complete CSS Framework for less than 45kb (8kB Gzipped) -

Lightweight and simple to use UI Kit. Fully responsive, just 3KB gzipped.

🌃 the design reference for the developers who care about good design.

Modern, modular, extensible button system designed for both rapid prototyping and production-ready applications

An elegant CSS Framework.

Material Design Components, Responsive and Modern CSS Framework Built with Flexbox 🍰

Most used UI Components — of web applications. Curated/Most loved components for web development

Flexible grid layouts to get you familiar with building within the flexible grid system.(HTML, CSS, SASS, SCSS)

Fluent Reveal Effect JavaScript library for web

Kule Lazy4 / CSS Framework

Flexbox Toolkit & Grid

Box - CSS Framework

An UI library for WeChat, includes widgets/modules in mobile web app.

Bulma SCSS - The Bulma CSS Framework files converted to SCSS syntax

A lightweight responsive Sass/CSS framework based on flexible box.

A UI component framework for building LCUI application.

🍱 A minimal CSS framework for web.

A lightweight front-end component library for developing fast and powerful web interfaces.

Website built with bootstrap 4 Framework

A simple framework for faster and beautiful responsive sites

A modern, light CSS UI framework by Shakr

Mockups with markup — https://sujan-s.github.io/fictoan/

Fluid Flex Solution for making infinite grid columns.

Pure CSS framework designed & developed by eBay for a branded, e-commerce marketplace.

A lightweight CSS framework that brings MacOS styled elements to Electron

Very simple CSS Framework

Scaffolding utility for vanilla-js

:ferris_wheel: simple stripped down css framework

Dead simple CSS framework now with Jekyll.

My own front end web development set up, covering everything from operating system to analytics.

Hızlı ve kolay web sayfaları geliştirin

A lightweight CSS framework written in Sass.

A package based CSS framework.

A maximalist css framework for making web apps fast

😸 A fast, friendly, and fun web UI kit for everyone.

10KB classless CSS framework with responsive typography, navbar, syntax highlighting, etc.

Terminal Style CSS Framework

The CSS framework built for any kind of task

Integrate Tailwind CSS in a Create React App setup

A vaporwave CSS framework 🌴🐬

RTL version of materializecss framework v1.0.0

A simple and to the point classless CSS framework

One Line CSS Framework

🎨 The Freshest CSS Framework

A new flexbox based CSS micro-framework.

💄 CSS UI kit with BEM convention and SASS

CSS at scale