GitHub - jgthms/bulma: Modern CSS framework based on Flexbox

avalanche | A package based CSS framework.

Avalanche is a robust foundation for a package based css workflow it consists of well tested css components to build unique looking websites

GitHub - twbs/bootstrap: The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

The most popular html css and java script framework for developing responsive mobile first projects on the web git hub twbs bootstrap the most popular html css and java script framework for

GitHub - twbs/bootstrap-sass: Official Sass port of Bootstrap 2 and 3.

Official sass port of bootstrap 2 and 3 contribute to twbs bootstrap sass development by creating an account on git hub

GitHub - Spiderpig86/Cirrus: The SCSS framework for the modern web.

Cloud the scss framework for the modern web contribute to spiderpig86 cirrus development by creating an account on git hub

GitHub - foundation/foundation-sites: The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites that work on any kind of device.

The most advanced responsive front end framework in the world quickly create prototypes and production code for sites that work on any kind of device git hub foundation foundation sites the m

Hocus-Pocus - Universal and lightweight stylesheet starter kit that focuses on base html elements and typography.

iotaCSS

Smart open source sass based oocss framework built for scale

Kickoff

Kickoff is a lightweight front end framework for creating scalable responsive sites

Documentation - Materialize

Materialize is a modern responsive css framework based on material design by google

mini.css - Minimal, responsive, style-agnostic CSS framework

Mini css is a tiny css framework designed to build quick modern and responsive websites

Scooter - Scooter has been deprecated

Sierra: The smallest and lightest SCSS library