While I was searching for an engine that I can use to homebrew the Xbox 360, I've come across an unfinished game engine called "Cafu".
It uses Half-Life MDL files and are quite easy to use. (At-least what it had is easy to use) I grew a huge interest in it, but alas it was REALLY unfinished so I couldn't do that much in it. I would want you guys to try it out because it's actually quite good. I know you people won't try to finish it so I won't bother with begging for a finished engine. But I would want to start some conversations involving this engine.