Boxcheats.com
Contains cheat codes for GTA 3 and Vice City. (Xbox)
eLook
Contains cheats and codes for Grand Theft Auto. (Gameboy Color)
GTA Cheatz
Offers cheat codes for all the games in the series for PC and PlayStation.
GTA:UK
Contains cheats and hints for GTA 1, London 1969, 2, and 3, for the PC, PlayStation, PlayStation 2, and Dreamcast.
The Grand Theft Auto Emporium of Fun
Contains hints, cheats, tips and graphics.
TotalGTA
Contains cheats from GTA 1 and 2 for the PlayStation and PC.