Someone did successfully instal and run Carrara 5 - check www.yahoogroups.com/group/CarraraFan
and look for recent messages (2-3 weeks back) on Linux
I think it was from that french-canadian guy at Flocquons de Paques
and he used SuSe Linux and latest Wine.

If that fails for Bryce or Poser or others, try finding a WIndows install CD (winXP preferred but others are supported too) and use Parallels for WIndows and Linux. It's about half the price of Paralels for Mac which is $79 if I recall. Check www.thebest3d.com/parallels

I recommend Parallels for Mac also for Project DOgwaffle and other WIndows-only applications