okay, by D&D,do you mean Drag & Drop or Dungeons & Dragons? (serious question, I've seen a few people ask for Dungeons & Dragons game makers <_<) If you mean Drag & Drop, check out Game Maker. If you mean Dungeons & Dragons, there isn't a specific game programming thing out there for D&D, but I would recommend you check out Neverwinter Nights & Neverwinter Nights 2 and their respective editor toolkits and probably create modules for them.