Your friends at MonkeyByte.com have just released a DEMO version of VistaPro for the Macintosh.
The world was created in 7 days, VistaPro can do it in 7 seconds.VistaPro is an ultra fast landscape generating program that uses DEMs (Digital Elevation Maps) to turn 2D topographical data, into beautiful 3D terrains. Create scenic fly-throughs, explore distant planets, or create your own landscapes all in a fractal of a minute.
You can find more information about the Mac version of VistaPro at the MonkeyByte.com Web site. VistaPro is available for US$45.00.