IGDB - An open video game database
Fling Trainer - Fling Trainer gives you the opportunity to download PC Game Cheats and Mods for many games without asking for any payment in return.
FreeToGame - Your digital game store where everything is free!
GameCopyWorld - An index for Game Backup Instructions, No CD Patches, and Game Trainers
The Visual Novel Database - VNDB.org strives to be a comprehensive database for information about visual novels.
GamePatchPlanet - GamePatchPlanet allows you to browse from a huge library of PC Cheat Codes, Tweaks, and Fixes, Trainers, Tools, Gaming news, Patches and download them for free.