I can't stand to post an answer here: In the early 2000s the following 3D programs have been state of the art:
form-Z, BoA, Bryce 3d, Maya, MetaCreations Ray Dream 3D, Ray Dream Studio, Poser, Cinema 4D XL, Carrara Studio. Always depending on what you like to do, modelling, constructing, animating, … Of course there have several more "not so popular"/older (from the late 90ies)/more simple programs been in existence.
I'd go that far to state that back than Mac OS 9 was the platform for 3D. And many of these programs are still good enough for many many tasks, and are highly professional.