A modern alternative to CSS resets

Tomorrow Theme

A showcase of problems once hard or impossible to solve with CSS alone, now made trivially easy with Flexbox.

Functional css for humans

Inactive project – please visit https://themeshaper.com/block-themes/ to learn more about the future of WordPress themes with Block Themes.

Compass is no longer actively maintained. Compass is a Stylesheet Authoring Environment that makes your website design simpler to implement and easier to maintain.

Low-level CSS Toolkit – the original Functional/Utility/Atomic CSS library

Simpsons characters in CSS

Powerful, scalable, Sass-based, BEM, OOCSS framework.

Chrome extension and Express server that exploits keylogging abilities of CSS.

An opinionated glossary of computer science terms for front-end developers. Written by Dan Abramov.

The default theme for Ghost

A curated collection of splendid gradients made in CSS3, .sketch and .PSD formats.

A wider selection of Prism themes

Simple, fluid, nestable, flexible, Sass-based, responsive grid system.

Media Queries mixins for Sass - fully customizable and very easy to use.

Collaborative typography project using select passages from Aesop's Fables set to Google Fonts

Matcha is a flat Design theme for GTK 3, GTK 2 and Gnome-Shell

A React wrapper for the site tour library Shepherd

🌊 Navigate the #perfmatters salt marsh waters in this NodeSchool workshopper

Casper 👻 theme for Wordpress

Tiny & beautiful site-wide progress indicator

Move the bellows

The same operations in React, Angular 1&2, Ember, Polymer, Vue, and Riot

A Sass mixin library

AMCSS documentation & examples

Landing page template for iOS apps

AngularJS based documentation generation: Extensible, customizable parsing and partial generation

Everything from reactjsnews.com :)

Minimal Gnome Shell Theme