[Edit] I screwed up on the thread title, lol. If a mod wouldn't mind fixing that for me I'd greatly appreciate it.
T.R.A.T. ( Terrain Randomizer And Texturer ) is a program that will randomly create a heightmap based on the settings provided. The program will also generate a texture for the created heightmap. Features include presets for randomly creating terrains such as: Mountains, Rivers, Shores, and more. You may also customize a randomly created heightmap. The program can be downloaded from my site ( requires flash ):
http://www.virtualdarkarts.com
Screenshots may also be viewed on the site above, but if you want a direct link to them all, you can view them here:
http://www.virtualdarkarts.com/z_pics/trat/
You are limited to 64x64 size heightmaps and textures. The program is $30 and will allow up to 2048x2048 size heightmaps once registered. This program requires the .Net Fraework 1.1 or higher to be installed and DirectX 9.0c.