Bootstrap

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

Free Open Source Self-Hosted JavaScript HTML5 Boilerplate

Materialize

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

Free Open Source Web

Skeleton

Skeleton is a small collection of CSS & JS files that can help you rapidly develop sites that look beautiful at any size, be it a 17" laptop screen or an iPhone.

Free Open Source Web

Purecss

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

Free Open Source Web

Metro UI CSS

Metro UI CSS a set of styles to create a site with an interface similar to Windows 8.

Free Open Source Web jQuery LESS

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

Responsable

Responsable is a responsive HTML CSS LESS SCSS framework with clean markup, normalized CSS, and responsive images. It allows for nested columns for easy grid nesting and...

Free Open Source Mac OS X Windows Linux

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

Kube Web Framework

Kube is one of the world's most advanced and flexible frameworks. Kube helps you spend less time on routine tasks and more time creating amazing products. Focus on...

Free Open Source Web

Sassy-validation

Sassy-validation is a Sass data type validation library. Validate inputted data or don’t Sass at all ! Sassy-validation is a handy addition for every Sass project...

Free Open Source Mac OS X Windows Linux Android 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

Frameless

Dig responsive design? Hate fluid grids? Try a Frameless grid.

Free Open Source Web

Gridless

Gridless is an optionated HTML5 and CSS3 boilerplate for making mobile first responsive, cross-browser websites with beautiful typography.

Free Open Source Web

Shine CSS Framework

A simple and lightweight CSS Framework.

Free Open Source Web

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