I am looking for a good application for generating 3d terrains (really allowing generation and then some user-editing) . After a google search, I found many, but I need one that can export the entire terrain as a mesh. This, I was unable to find. (I need either a .obj .fbx or .3ds output) The size of the file that is written and the price of the program are not major factors in my decision.
Using Assimp you can convert from a lot of formats to .obj I think that the usability of the tool should be your first priority as the formats can then be converted by your application.