Check this link out from Reality Interactive...
http://www.realityinteractive.com/software/faq.html
A platform for Java Games based on LWJGL using Quake formats. Neat.
I installed it an ran it and I must say it was quite impressive in terms of speed.
Every time I try to download it, I get a few megs in and then it just... stops.
Bah.
Cas :)
Keep trying or I can send it to you.
Let me know...
-D