AutoTileSet (DLC)

After creating your tiles with AutoTileGen you can easily edit your levels with AutoTileSet. AutoTileSet is an autotile tool that picks the correct image for each tile depending on its neighbours. You only have to worry about whether tiles are solid or not and AutoTileSet will take care of the rest.
AutoTileSet is compatible with the most popular game development middlewares: Unity, GameMaker and Construct 2.