Terragen Gallery
I have one image so far in my gallery at Ashundar. I read a few tutorials for making planets with Terragen, but still had to figure out several things on my own in order to generate the picture. I’m hoping to write my own planet tutorial before I forget what I did.
I found Terragen back when I was looking for mapping software like Grass. You can feed a real elevation map into Terragen as well, but the focus is more on art than accuracy.