Vaadin 6, 7, 8 is a Java framework for modern Java web applications.
Odoo Mobile Framework
Java RBroker Framework for DeployR
Leading REST API framework for Java
Cuppa - A testing framework for Java 8+
Datumbox is an open-source Machine Learning framework written in Java which allows the rapid development of Machine Learning and Statistical applications.
Hands on with Spring Framework MVC module
[DEPRECATED] The Google Media Framework (GMF) is a lightweight media player designed to make video playback and integration with the Google IMA SDK on Android easier.
Simple blog web app made using Play Framework + Twirl