Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Foundation - The most advanced responsive front-end framework in the world
yeti.css - &yet's lightweight, modular pattern library written in Stylus.
Semantic UI - A UI Component library implemented using a set of specifications designed around natural language
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