There's always Terragen (great landscapes, skies, and water..just no trees..sigh) free program from Planetside. Bryce 5.0 (as I understand) is about $20 at Daz right now (if only I'd waited 4 years, how much I coulda saved..;) Mojoworld and World builder were offered on the 3d Brit mags

3d World, Digit, Computer Art

but you had to be there; I'm told that if you get back-ordered issues, you don't get the software. Older versions, but for about $15 US, you can get a complete package. Always worth scopin' out, if not buying or getting  a subscription.

Just some other avenues to drive down..;)

 

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

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