Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Apache Cordova - Platform for building native mobile applications using HTML, CSS and JavaScript
Dropsource - Mobile development platform for building native iOS & Android apps
React Native - A framework for building native apps with React
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!
PhoneGap - Easily create apps using the web technologies you know and love: HTML, CSS, and JavaScript.