iOS Stack - A curated collection of iOS resources for app builders
Grails - An Open Source, full stack, web application framework for the JVM
iOSStash - A huge collection of app-related tools
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
AppNext - AppNext offers mobile monetization and app distribution solutions.
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.