If i am not wrong, 3d object converter allowed to import md5b (md5 binary) models (Etqw and Wolf09 uses them in mp). You can't release those models ofc.
Check it out if it works.
But still cannot find the tools. I remember that I imported the Tesla Gun to Doom 3 for testing purposses (just like many other models, but finally deleted them from hdd, to don't break the rulesss).
edit: Searched in the interwebs and... quite funny that it is for Gmod... http://www.garrysmod.org/downloads/?a=view&id=78797
ohhh and the lovely Mite-Crabhttp://www.garrysmod.org/downloads/?a=view&id=108822
At least they credited the authors in the Mite one.