SMB Utility - This is the most amazing SMB editor yet.

GameCopyWorld - An index for Game Backup Instructions, No CD Patches, and Game Trainers

Cheat Engine - Cheat Engine is an open source memory scanner/hex editor/debugger for Windows.

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.

SMB Title Screen Editor - A title screen editor for Super Mario Bros. GUI is in Japanese. English readme created by AP.

WeMod - Personalize your gaming experience Thousands of free mods and trainers for your favorite single-player PC games — all in one place.