NoCode.tech - Free tools & resources for non-tech makers and entrepreneurs
Grails - An Open Source, full stack, web application framework for the JVM
Makerpad - Learn to build and launch your startup in 30 days, for free
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
NoCodeDevs - The largest directory of tools & resources for non-tech startups and entrepreneurs!
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.