TERRAGEN – Landscape and Scenery Creator
Freeware Mission has a post on TERRAGEN – Landscape and Scenery Creator.
“Terragen is a free program while lets you create beautiful landscapes and sceneries. In fact, it is the first ever program to offer rendering of realistic sceneries in one complete way. The best part about Terragen is that it lets you get into the in depth detailing of the scenery. Although it offers a detailed and elaborated user interface, but it is worth using as the output can be made look like a highly professional one with number of special effects.”