Twitter Bootstrap is a free collection of tools for creating websites and web applications.
Bootstrap is also a platform with 6 apps listed on AlternativeTo. Browse all 6 apps for Bootstrap
Foundation is an easy to use, powerful, and flexible framework for building rapid prototypes and production code on any kind of device.
Semantic empowers designers and developers by creating a shared vocabulary for UI.
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. Skeleton is built on three core...
A unified, HTML5-based user interface system for all popular mobile device platforms, built on the rock-solid jQuery and jQuery UI foundation. Its lightweight code is built with progressive enhancement, and...
Metro UI CSS a set of styles to create a site with an interface similar to Windows 8 .
Material design visual web framework
Simple bootstrap from Twitter with Metro style.
A set of small, responsive CSS modules that you can use in every web project.
MUI is a lightweight HTML/CSS/JS framework that follows Google's Material Design guidelines
Welcome to Blueprint! This is a CSS framework designed to cut down on your CSS development time. It gives you a solid foundation to build your own CSS on. Here are some of the features BP provides...
Refills are prepackaged patterns and components, built on top of Bourbon, Bitters and Neat.
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 customization, and provides base styles...
Flat UI Pro is made on the basis of Twitter Bootstrap in a stunning flat-style, and the kit also includes a PSD version for designers. Flat UI Pro contains a huge number of basic components, icons and glyphs.
Topcoat is a brand new open source CSS library designed to help developers build web apps with an emphasis on speed. It evolved from the Adobe design language developed for Brackets, Edge Reflow, and feedback...
The Goldilocks Approach to Responsive Web Design - A good starting point for design that takes device resolution out of the equation.
Google's front-end web framework for building sites to the Material Design specification.
A grid system for responsive web design. Includes folding columns, elastic gutters, a zoomable baseline grid, and a delightful grid overlay script.
A Mobile First Responsive CSS Framework which is super simple to learn, rock solid and light, yet has all the goodies web developers need to create fast, responsive, modern, great looking websites.
The ‘tiny screen first’ responsive boilerplate.
Less Framework is a CSS grid system for designing adaptive websites. It contains 4 layouts and 3 sets of typography presets, all based on a single grid.
Sass data type validation library
Lightweight front-end framework for logically building complex, responsive web projects.
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