Architecture Rules is a Java library that allows a programmer to assert code's architecture via unit tests or ant tasks. This test is able to assert that specific packages do not depend on others and is able to check for and report on cyclic dependencies among your project's packages and classes. This project wraps a industry accepted JDepend to simplify the process of maintaining a solid software architecture.
J4ME is a library to help with J2ME development. It includes a UI framework for professional-looking and intuitive interfaces, a logging framework to help debugging platform-specific issues found on different phones, a Bluetooth GPS integrated into the JSR-179 Location API, and a library of missing J2ME methods and helpful collections for small devices.
IT Mill Toolkit is a server-side RIA (Rich Internet Application) library that provides a versatile set of AJAX widgets for Java programmers. Applications are programmed in Java and executed server-side. At the client-side (i.e. in the browser), enhanced GWT widgets are used for presentation.
Apache ActiveMQ is a popular and powerful message broker and enterprise integration patterns provider. Apache ActiveMQ is fast, supports many cross language clients and protocols, comes with easy-to-use enterprise integration patterns and many advanced features, while fully supporting JMS 1.1 and J2EE 1.4.