OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
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!
Grails - An Open Source, full stack, web application framework for the JVM
GoodBarber - GoodBarber is a mobile app creation platform.