Dungeon Template is a PSD file for use with photoshop. It is a template for the design of dungeon maps. You should not only own photoshop (Or Gimp), but also have a solid understanding of Photoshop basics.
Also included is a GIMP version (.xcf), though, it lacks the blending effects of the PSD file.
There are 3 versions in total. .psd (Try this first), .psd (Max compatibility), and .xcf (Gimp).... [click here for more]