We are undertaking the kind of insane project of rewriting the famous game Nethack in Java, so it can be used on any platform that has Java implemented on it. We plan to rewrite the windowing system in Swing, and hopefully have a terminal-based interface as well, for old-time's sake. :)
Currently, we have nothing to release - the project is in its early stages of converting the C code to Java. If you would like to help, let us know. Right now, "us" is only "me", so email me if you're interested in helping out.
Thanks for your interest, in any case. Hopefully, we'll have more news soon!