Here are some more.


Leveller
http://www.daylongraphics.com/products/leveller/
Great program for serious application or just fooling around


ImageSynth2
http://www.luxology.com/imageSynth/
Excellent for creating seamless textures from ANY image

MicroDem
http://www.usna.edu/Users/oceano/pgu...m/microdem.htm
Free - useful for opening DEM (Digital Elevation) files

Texture Maker
http://www.texturemaker.com/news.php

Flaming Pear
http://www.flamingpear.com/products.html
Photoshop plugins. India ink and Lunar cell are pretty cool

The heavy weights ...

Global Mapper
http://www.globalmapper.com/
The Daddy ...

VNS3
http://3dnature.com/vns3.html
Excellent! good for ecosystems - massive learning curve but worth it

CityEngine
http://www.procedural.com/
Pain to use ... has some cool features such as importing OSM (Open Street Map) data