WeMod - Personalize your gaming experience Thousands of free mods and trainers for your favorite single-player PC games — all in one place.
GameCopyWorld - An index for Game Backup Instructions, No CD Patches, and Game Trainers
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.
Cheat Engine - Cheat Engine is an open source memory scanner/hex editor/debugger for Windows.
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.
CoSMOS - CoSMOS is a Advanced Memory Scanner and Gamehacking Tool