Free World Building Software--- Free Software ---Free World Building Software3 years ago in Other More Like This
Wilbur (last update: June 2005) (http://www.ridgenet.net/~jslayton/software.html)
Wilbur is an old program (which is funny if you consider 5 years old. But it is very simple to use to make planets quickly. It hasn't been updated in a long time, but I checked the website and the program and it seems to work well enough.
Terragen and Terragen 2 (http://www.planetside.co.uk/)
The original was an awesome program that created amazing landscapes with very little effort and ease. The learning curve for the first version is pretty easy. It's successor is a completely different way of making landscapes. It takes much lon