Galen Framework - Automated testing of look and feel for your responsive app
Reapp - An easier, faster way to build apps with React and JavaScript.
Onsen UI - HTML5 Hybrid Mobile App UI Framework - work with Angular, React, Vue, Meteor & pure JavaScript. Material & Flat design.
RestControl - Modern and powerful framework for testing and validation REST api
Ionic - Ionic is a cross-platform mobile development stack for building performant apps on all platforms with open web technologies.
React Native - A framework for building native apps with React