I use terragen to it aint no free ware lol... you can also export your work in terragen into maya.
A great mod for Jedi academy
www.moviebattles.com
Computer Rig-
64-bit vista
23.5 inch LCD + a 19 inch
Q6600 intell qaud
4 gigs of ddr2 ram
8800GTS 512 video card @700mhz