IGDB - An open video game database
GameCopyWorld - An index for Game Backup Instructions, No CD Patches, and Game Trainers
FreeToGame - Your digital game store where everything is free!
Project Cheat Codes - A project to bring cheat codes for all games into one light-weight, offline-compatible, mobile application. With weekly updates that add a fresh crop of games, you can be sure to find cheats for many of your favorites.
The Visual Novel Database - VNDB.org strives to be a comprehensive database for information about visual novels.
Cheatbook DataBase - CheatBook DataBase 2012 - The encyclopedia of game cheats.