Bootstrap

Bootstrap is a open-source collection of tools for creating browser sites and applications.

Free Open Source Self-Hosted JavaScript HTML5 Boilerplate

Foundation

Foundation is an easy to use, powerful, and flexible framework for building rapid prototypes and production code on any kind of device.

Free Open Source Web

Materialize

Materialize is a modern responsive CSS framework based on Material Design by Google

Free Open Source Web

Bourbon

Bourbon - A simple and lightweight mixin library for Sass / CSS.

Free Open Source Mac OS X Windows Linux Sass

Purecss

A set of small, responsive CSS modules that you can use in every web project.

Free Open Source Web

GroundworkCSS

GroundworkCSS is a 100% free and open source responsive HTML5, CSS and JavaScript Framework.

Free Open Source Web Self-Hosted

Spectre.css

Lightweight, responsive and modern CSS framework for faster and extensible development.

Free Open Source Web Self-Hosted

Material Design Lite

Google's front-end web framework for building sites to the Material Design specification.

Free Open Source Web GitHub

Refills

Refills are prepackaged patterns and components, built on top of Bourbon, Bitters and Neat.

Free Open Source Web

yeti.css

yeti.css is a pattern library consisting of lightweight, reusable modules. It has been built to reflect &yet's visual and branding guidelines.

Free Open Source Mac OS X Windows Linux Self-Hosted

Element UI

Element, a Vue 2.0 based component library for developers, designers and product managers.

Free Open Source Web Self-Hosted JavaScript Vue.js CSS

inuit.css

inuit.css is a lightweight, constantly updated CSS framework which provides you with a pragmatic and feature-rich starting point for all your projects. It is crammed...

Free Open Source Web

react-md

This project's goal is to be able to create a fully accessible material design styled website using React Components and Sass.

Free Open Source Self-Hosted

Susy

Susy: un-obtrusive grid system for designers, built on Compass and Sass

Free Open Source Web

Basis

Clean code development ====================== The Basis classes have prefix. And code style is BEM (MindBemding) and using Stylus. You can use it as CSS framework or...

Free Open Source Self-Hosted

Microsoft Web Framework

MWF is a system that allows site authors to consider how best to tell the story of Microsoft products and services with confidence that the modular pieces will support...

Free Open Source Self-Hosted

Responsive Grid System

This is the Responsive Grid System, a quick, easy and flexible way to create a responsive web site.

Free Open Source Web

Simple Grid

A simple, lightweight, responsive, 12-column grid and container system for your website.

Free Open Source Web Self-Hosted

Cascade Framework

Although the overall look and feel are most definitely inspired by Twitter Bootstrap, Cascade framework is not just another Bootstrap clone. Where Twitter Bootstrap puts...

Free Web