Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Dropsource - Mobile development platform for building native iOS & Android apps
Swift Bootstrap - Develop iOS apps faster
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions