Devious Finish Your Engine :P

As I know currently 3D engines was used by BMaxers:

Plain OpenGL or Relatives
Many ppl are developing wth this..don't know which is best

3Impact by Gman
Irrlicht by Gman
http://www.gprogs.com/forum/

Eliza3D
http://www.tmyke.fr/

Ogre3D
Forget who did it, I only saw a demo with it, but really works.

ColdSteel
http://www.coldsteelengine.com/

Personally using 3Impact(thanks gman for great module)