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Vaadin 6, 7, 8 is a Java framework for modern Java web applications.
Odoo Mobile Framework
Cuppa - A testing framework for Java 8+
Leading REST API framework for Java
Repository for Spring Framework MVC
Datumbox is an open-source Machine Learning framework written in Java which allows the rapid development of Machine Learning and Statistical applications.
[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.
Elegance, high performance and robustness all in one java bean mapper
JSON API library for Java