Zmodeler has been around for some time. I'm still using version.99 (less buggy)
I used it to convert Need4Speed and 4x4Evolution vehicles to MTM2 format (.bin). Usually this requires remapping the whole model, which I eventually do with BinEdit. I still haven't learned to map in Zmodeler yet. Some people have used it to convert MTM2 trucks to other games as well
Many modelers use Zmodeler to make original car models. You can put car profile pics in the 3 windows (front, side & top) and build the model mesh over it.
Zmodeler works with NFS 4 and 5, sports car GT, 4x4 EVO, and a few other games.
Here a page with some of the vehicles I converted and modified to MTM2 format using ZMODELER...
http://bigdogge.homestead.com/conversions.html [This message has been edited by ZO_BigDOGGe (edited 02-06-2001).]