PlayOnLinux (PlayOnMac ) is a tool to help Linux (and Mac) users run games and programs for Windows.

Boot Camp Assistant is a multi boot utility included with Mac OS X that assists users in installing Microsoft Windows operating systems.

WineBottler packages Windows-based programs snugly into OS X app-bundles. No need to install emulators or operating systems.

Wineskin Winery is a tool for Wineskin.