OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Grails - An Open Source, full stack, web application framework for the JVM
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
Open As App - Automatically create a business app from a spreadsheet, no coding.
Apache Struts - Apache Struts is an open-source web application framework for developing Java EE web applications.