Well, Tilemap editing is one capability, but it's a composite of many efforts. For instance, The base texture is a single image that the user can edit with different terrain styles and brushes (painting on grass, dirt, river, etc), so it's not tile-based in that respects, and there are tokens that are free-moving too (not restrained by the 72 x 72 pixel snapping)
Then, when they're down, they can export the entire thing as a jpg, png, tga, whatever.
Then, when they're down, they can export the entire thing as a jpg, png, tga, whatever.