Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Anima App - Design, get feedback, convert to code, publish, iterate.
Ionic - Ionic is a cross-platform mobile development stack for building performant apps on all platforms with open web technologies.
Timeline for Sketch - Create beautiful timeline animations in Sketch
Apache Cordova - Platform for building native mobile applications using HTML, CSS and JavaScript
Auto-Layout for Sketch - Responsive design for Sketch