BeanClipse is a NetBeans plugin for Eclipse: NetBeans runs embedded within the Eclipse platform as a plugin offering the best of both worlds to Java developers.
May be just a joke ;-) ....
Check also it's twin at : http://sf.net/projects/netclipse
The XMLTester is an open-source platform for system-level testing of message based XML applications, including "Web Services" applications. XMLTester is implemented primarily in Java.
Please see www.xmltester.org for details.