Meshwork is a 3D triangle-mesh modeling program for MacOS. It is designed especially for making compact, efficient objects for use in 3D games or on the web.
It imports and exports several file formats, including DXF and optimized 3DMF. It can also be used to produce VRML for the web, models for POV-Ray, sprites, models for OpenGL applications, and more.
This is the best tool ON THE PLANET! I use it to create the graphics for all my games! (Alot of people don't know about the "SMOOTH" option, it is very useful and decreases loading time!)