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Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Appcelerator Titanium - Appcelerator Open Source
Semantic UI - A UI Component library implemented using a set of specifications designed around natural language
React Native - A framework for building native apps with React
Onsen UI - HTML5 Hybrid Mobile App UI Framework - work with Angular, React, Vue, Meteor & pure JavaScript. Material & Flat design.
Apache Cordova - Platform for building native mobile applications using HTML, CSS and JavaScript