Awesome CSS Frameworks

List of awesome CSS frameworks.
Feel free to contribute.

Supported by FrontAid CMS:

Base / Reset / Normalize
Class-less
Very Lightweight
General Purpose
Material Design
Specialized
Toolkits
Stalled Development

Base / Reset / Normalize

normalize.css - Modern, HTML5-ready alternative to CSS resets.
Repo | #CSS
sanitize.css - The best-practices CSS foundation.
Repo | #CSS
minireset.css - Tiny modern CSS reset.
Repo | #Sass
inuitcss - Extensible, scalable, Sass-based, OOCSS framework for large and long-lasting UI projects.
Repo | #SCSS
ress - Modern CSS reset.
Repo | #CSS
modern-normalize - Normalize for Chrome, Firefox, and Safari only (no support for Edge or Internet Explorer).
Repo | #CSS

Class-less

Frameworks that use semantic HTML and do not rely on classes.

Water.css - Just-add-CSS collection of styles to make simple websites just a little nicer.
Repo | #CSS
sakura - Minimal classless CSS framework/theme.
Demo, Repo | #SCSS
Marx - Classless CSS reset.
Docs, Repo | #SCSS #Stylus
Tacit - CSS framework for dummies, without classes.
Repo | #SCSS
awsm.css - CSS library for semantic HTML markup without classes, attributes, etc.
Demo, Repo | #SCSS

Very Lightweight

Frameworks that are smaller than ~5KB.

Pure - Set of small, responsive CSS modules that you can use in every web project.
Demo, Docs, Repo | #CSS
Milligram - Minimalist CSS framework.
Docs, Repo | #Sass
Picnic CSS - Lightweight and beautiful library.
Demo, Docs, Repo | #SCSS
Wing - Beautiful CSS framework designed for minimalists.
Docs, Repo | #Stylus
Chota - Really small CSS framework.
Repo | #CSS

General Purpose

Bootstrap - The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
Demo, Docs, Themes, Repo | #SCSS
Semantic UI - User interface is the language of the web.
Note: The project seems to be inactive but there is an active fork called Fomantic UI.
Docs, Repo | #LESS
Bulma - Modern CSS framework based on Flexbox.
Demo, Docs, Repo | #Sass
Foundation - The most advanced responsive front-end framework in the world.
Demo, Docs, Repo | #SCSS
UIkit - Lightweight and modular front-end framework for developing fast and powerful web interfaces.
Demo, Docs, Repo | #LESS #SCSS
Spectre.css - Lightweight, responsive and modern CSS framework.
Docs, Repo | #SCSS
Tachyons - Quickly build and design new UI without writing CSS.
Demo, Docs, Repo | #CSS
Primer - CSS framework that powers GitHub's front-end design.
Docs, Repo | #SCSS
Carbon Components - Component library behind IBM's Carbon Design System.
Docs, Repo | #SCSS
Blaze UI - Open source modular toolkit providing great structure for building websites quickly with a scalable and maintainable foundation.
Demo, Docs, Repo | #SCSS
PatternFly - UI framework for enterprise web applications.
Demo, Docs, Repo | #SCSS #LESS
Base - Rock solid, responsive HTML/CSS framework.
Docs, Repo | #SCSS #LESS
turretcss - Responsive front-end framework for accessible and semantic websites.
Demo, Docs, Repo | #CSS
Cirrus - Responsive and comprehensive CSS framework with beautiful controls and simplistic structure.
Docs, Repo | #CSS
HiQ - Simple CSS foundation with responsive typography and input styling.
Docs, Repo | #PostCSS

Material Design

Material Components Web - Modular and customizable Material Design UI components for the web.
Demo, Docs, Repo | #SCSS
Materialize - CSS framework based on material design.
Demo, Docs, Repo | #SCSS
MUI - Lightweight CSS framework that follows Google's Material Design guidelines.
Docs, Repo | #SCSS
Propeller - Front-end responsive framework based on Google's Material Design standards & Bootstrap.
Docs, Repo | #SCSS

Specialized

Tailwind CSS - Utility-first CSS framework for rapid UI development.
Docs, Repo | #CSS
NES.css - NES-style CSS Framework.
Docs, Repo | #SCSS
98.css - CSS library for building interfaces that look like Windows 98.
Repo | #CSS
Gutenberg - Modern framework to print the web correctly.
Demo, Repo | #SCSS
Tufte CSS - Style your webpage like Edward Tufte’s handouts.
Repo | #CSS
Bojler - Email framework for developing responsive and lightweight email templates.
Docs, Repo | #SCSS

Toolkits

Toolkits are closer to a library than to a framework. They do not provide actual styling but utilities (e.g. mixins) that you can use in your CSS preprocessor.

Bourbon - Lightweight Sass tool set.
Docs, Repo, Scaffold | #SCSS

Stalled Development

Frameworks that have not seen any real development for more than about one year or officially have been deprecated. We are keeping them here for reference/inspiration and hope for a revival.

Show Section

Material Design Lite - Material Design components in HTML/CSS/JS.
Demo, Docs, Repo
Skeleton - Dead simple, responsive boilerplate.
Demo, Docs, Repo
Compass - Open-source CSS authoring framework.
Docs, Repo
Flexbox Grid - Grid based on CSS3 flexbox.
Repo
Basscss - Low-level CSS toolkit.
Repo
Neat - Lightweight and flexible Sass grid.
Demo, Docs, Repo | #SCSS
mini.css - Minimal, responsive, style-agnostic CSS framework.
Docs, Repo | #SCSS
Mobi.css - Lightweight, scalable, mobile-first CSS framework.
Docs, Repo | #CSS
Pills - Simple responsive CSS Grid for humans.
Repo
Cutestrap - Sassy, opinionated CSS framework, a tiny alternative to Bootstrap.
Repo
unsemantic - Fluid grid for mobile, tablet, and desktop.
Demo, Docs, Repo
Kube - Web framework for professional developers and designers.
Docs, Repo | #SCSS
Concise CSS - Give up the bloat. Stop tripping over your classes. Be concise.
Docs, Repo | #SCSS
Scooter - SCSS framework & UI library for Dropbox web.
Repo
Responsive Boilerplate - Powerful, accessible, developer friendly framework for building responsive websites.
Docs, Repo | #SCSS
Centurion - Web-based framework for rapid prototyping and building larger web projects.
Docs, Repo