You Know What Part

"Let us think the unthinkable, Let us do the undoable, Let us prepare to grapple with ineffable itself, And see if we may not eff it after all." Douglas Adams

New Edition of Computer Arts has a free copy of Bryce 4

Looks like you can get a decent landscape renderer from Computer Arts for free; Bryce 4 (the previous version) is on the CD that comes with the magazine. I’ve purchased this from Barnes & Noble before (in-store).

Computer Arts website also has a great download section with lots of tools.