what sort of tools/programs do people use to make them?
Trying out Large 3D Terrain (L3DT) today, and it looks promising, but we're curious what others are using. (takes time to make a mesh of 1.6x1.6km, particularly when the grid unit size is 0.2m)
we'll see how the latest attempt in l3dt works first then... figured out how to get it to use a bit less ram (it wanted to use something like 200% of what we had). That will probably take some time, as we told it to generate about a square mile, with 10cm grid. Yes, that is about 250m rectangles, and probably twice that number of polygons. If that fails, it fails.
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we're having trouble getting L3DT to work... both due to a few bugs and due to memory issues...
Terragen has a free version available, and I believe that Vue has a basic version with a low price.