WeMod - Personalize your gaming experience Thousands of free mods and trainers for your favorite single-player PC games — all in one place.
Parallels Workstation - + Professional-grade Virtualization for PCs:
scanmem & GameConqueror - GameConqueror is a GUI for scanmem.
JoyToKey - JoyToKey enables users to control the keyboard using any USB compatible controller (Dualshock 3, Xbox 360, etc.)
Cheat Engine - Cheat Engine is an open source memory scanner/hex editor/debugger for Windows.
PlayOnLinux - PlayOnLinux will allow you to play your favorite games on Linux easily