The folks at Runic have just released GUTS, their Torchlight 2 editor.Torchlight 2 now has a Workshop on Steam! To support Runic's launch of the workshop and the user generated content for this game, we've opened up a Steam Workshop thread for it on Polycount.
GUTS, the editor created by Runic for Torchlight 2, will let users create custom mods, items, animations, level layouts, item skills and so on.
Check out the GUTS wiki for more information:
To celebrate the release of GUTS, Torchlight is 50% off ($9.99) on Steam until April 8th