PowerMock allows you to unit test code normally regarded as untestable. For instance it is possible to mock static methods, remove static initializers, allow mocking without dependency injection and more.

Aion Emulation Project

Is a continuation from various projects notably:
Aion Core
Aion Engine
Aion Emu
AionJ Hungary (some changes from it)
Aion Lightning (some changes from it)
Aion Unique (some changes from it)

The Apache Java Enterprise Mail Server (a.k.a. Apache James) is a 100% pure Java SMTP and POP3 Mail server and NNTP News server. James is a complete and portable enterprise mail engine solution based on currently available open protocols.

James is also a mail application platform. We have developed a Java API to let you write Java code to process emails that we call the mailet API. A mailet can generate an automatic reply, update a database, prevent spam, build a message archive, or whatever you can imagine. A matcher determines whether your mailet should process an email in the server. The James project hosts the Mailet API, and James provides an implementation of this mail application platform API....

The Riena platform is the foundation for building multi-tier enterprise client/server applications. As such Riena is broadening the usage of the service oriented architecture of OSGi/Equinox by providing access to local and remote services in a transparent way. Using this uniform programming model, the components of Riena and the business components of the enterprise application can be developed regardless of their target location. Components are later easily placed on client or server depending on the business requirements....

Maven plugin that creates a diagram of all dependencies The entire transitive closure.
Work as part of Maven report as well as standalone.

The IM Gateway plugin for Openfire provides connectivity to other IM networks (AIM, ICQ, IRC, MSN, Yahoo, etc). It uses internal mechanisms to smooth the interaction with the various transports that standard transports can not currently provide.

Full-featured jabber client for mobile phones. Requires MIDP2.0 phone.

sources in svn:
https://svn.xmpp.ru/repos/bombus/trunk

The JInput Project hosts an implementation of an API for game controller discovery and polled input.

Painless integration testing for OSGi (formerly known as Pax Drone).,

Oryx is a web-based editor for modeling business processes in various modeling languages like BPMN or EPC. You can create models and share them with your business partners, clients and friends. You may not only share a model with your colleagues, but discuss and improve it within one working environment. Thus, Oryx brings all the advantages of Web 2.0 into the world of modeling. To start modeling you need zero installation–your model is just one click away....