Terragen 2, a landscape generator. I've done three things so far that I am quite pleased with, and am slowly getting the hang of it. It's scarily complicated when you start out, but there are some good tutorials and you get such COOL effects!
I worked with Terragen back when it was 0.6 and didn't even have reflections in water. It just may be the best terrain generator around today. And I can see you've already acquired a certain degree of skill with it. :)
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Have fun!
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