I was gonna bring up Blender, but about 30 people got there first..;) It's free, it has some useful tools, but any time I want to fuss about Bryce interfaces, I remember Blender (and Truespace, with the 'q-bert'-style menus...;) 

I use it for a very few limited number of things , like discombobulating (heresy by thought), and some occasional organic-style primitives (heresy by word and deed..;) 

What I wish (and don't a lot of us..;) was that you could just take a 'tray' of controls from another program (mojoworld, wings, Poser, whatever) and use those commands in Bryce, and vice versa...there'd be money in that...;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)