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On this site you will find info on NASA WorldWind, PlanetSide's
Terragen, links to related websites and some useful scripts that might
help you in using these programs, like a distance converter and a world
time page.
World Wind is a program that creates a 3D globe out of satelite imagery
and allows you to zoom in on the 'globe'.
Terragen is a 3D terrain/landscape renderer, in which you can draw the height maps
and form the terrain.
The following are some links related to WorldWind and Terragen.