The terrain editor can be used to create professional terrains in the OBJ format. You can then change the format using a file convertor. If you need a free 3D file convertor you can download this one free of charge: Model Convertor
The terrains can be used any way you choose, personal or commercial and or in any number of projects. This version has higher resolution graphics to paint the terrains with, and since you save the terrain UV work as separate files you can doctor individual pieces to match what you want them to match.
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