The only _free_ 3d program for linux that is operational that I know of is Blender. Sadly, the company has gone under. They're trying to raise money...if they raise enough, they say they'll make Blender open source. But until then, I believe nobody is developing Blender.
http://freshmeat.net/browse/109/?topic_id=109
It seems that quite a few of pro. 3D modelers use SUN Solaris. I'm not sure if they're run on x86 or SPARC...but I just know people use it  The majority of them don't use Winders.
I'm not totally sure on any CAD programs for linux, though. I know of a lego cad program named leocad 
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