TerreSculptor 2 has been released by Demenzun Media. This is the last version of its procedural terrain creation software.TerreSculptor appeared in 2012. There were 2 versions: free and paid. This version is completely free, but everyone has an opportunity to support the software and make a donation here.
There are lots of useful features for terrain creation: 22 generator types, 11 weight map extractors, 6 adjust tools, 19 modify tools, 21 transform tools and more. Read more about other features here.
It also features wide measure of support for file types including the ability to read DEM files.