Some things:

• The Collation Project: Information about trading card games' collation
• unluac: A decompiler for the Lua programming language
• saga2edit: An editor for Final Fantasy Legend II (AKA SaGa 2: Hihou Densetsu) and accompanying reverse engineering work
• "Inferno": A module for the roguelike game "DRL" (P.S. Kornel Kisielewicz is a cool dude)
• Kingdom of Loathing diet calculator
• Reverse engineering work for Moraff's Dungeons of the Unforgiven (largely incorporated into Cagey Rabbit's FAQ) (additional inquiries accepted)