Cheat Code Central: Nintendo GameCube Codes
Provides cheats, hints, tips, and strategy guides.
Codes Headquarters - Game Cube
Tips, codes, Pro Action replay codes, and interaction.
Console Cheat Codes
Contains cheats and codes for the system.
GameFAQs
GameCube cheats, faqs, walkthroughs, and message boards.
Total Cheats - Game Cube
A large database of cheats and codes for GameCube games.