GitHub Stars: 92,500
Components: 12+ reusable components
Material Design Lite
With Google’s material design on the rise in mobile and web applications, its increasing important to be familiar with a material design framework. Material Design Lite is a prefect framework for incorporating material design into your website. MDL is lightweight and incredibly simple to use.
Size: 27KB gzipped
GitHub Stars: 18,700
Pure or PureCSS is a set of small responsive components built by Yahoo. Pure is a purely CSS framework with a miniature footprint at only 4.0kb when minified and zipped. This is great for developers who only need a basic set of tools and not a bloated full-featured framework.
Size: 4.5KB minified + gzip
GitHub Stars: 13,400
Self-proclaimed as the most advanced responsive front-end framework, Foundation is an advance, powerful, and comprehensive responsive front-end framework used to facilitate the design of websites, emails, or apps. If you want a strong solid foundation for your website interface, use ZURB’s Foundation.
GitHub Stars: 22,600
UIkti is a lightweight and customizable framework for web interfaces. UIKit provides over 30 modular components that are extensible and customizable. Components can be effortlessly combined and implemented.
GitHub Stars: 6,200
Semantic UI is a unique front-end framework using “human-friendly” HTML. Semantic provides an impressive library of over 50 components to help you build beautiful responsive websites. With many unique components not found in other frameworks, make a great adding to any web projects.
GitHub Stars: 23,200
Skeleton is a simple and super lightweight library of UI components. According to the developers, Skeleton is not a UI framework but a “starting point”. Skeleton contains only 400 lines of CSS code and is intended for smaller, simpler projects.
GitHub Stars: 11,000