PIGZELNER  This is the most impressive 3D modelling software written in Java I have ever seen, especially when it is 100% free!

Rendering is a slow process, but you can get quite good-looking and realistic results.

I would recommend Aoi for hobbyists and those who want to experiment with 3D scenes and modelling. The Art of Illusion's website has a nice tutorial that tells you step by step how to create a realistic hourglass, perfect for those who have never been creating 3D graphics before, or those who just want to look at the apps features!  
(Version 2.4.1)

ANOTHERUSER  Art of Illusion is "written entirely in Java", which means this software should be listed as a PPC/Intel App, not just "PPC", right?  
(Version 2.4.1)