Okay, Lets see... I think I'm certified-insanely-nutter... My list of GM Tools includes:

HeroLab (with a bunch of systems, extra packs and licenses), GCA, Wild Card Creator, Realm Works (GM edition, until now; before was Scrivener), EpicTable, CC3+ with Dungeon Designer, City Designer, Fractal Terrains 3, Symbol Set 1 and 4. A plethora of self-made applications (yes, I'm a programmer) and lot of macro-enabled, self-made-spreadsheets-and-pdf-sheets and other things I can't remember right now.