WINE
WINE is a Free(Free Beer and Freedom), Open-Source Program for GNU/Linux, Mac OS X, and BSD that allows non-Windows users to run Windows Programs without Emulation.
Current Versions
Stable: 1.2.3 Beta: 1.4-RC5
WINE's Definition
WINE is an Acronym for WINE Is Not an Emulator. This is true. WINE does not Emulate, it expands the Kernels of the Operating System to be able to run Windows Programs. So what it really does is tries to combine Windows with GNU/Linux, Mac OS X, and BSD.
Current Errors
Due to Errors in V1.0.1, it is highly recommended to use V1.1.41 if you are planning on running games made in Game Maker. V1.1.41 supports Game Maker 1 thru Game Maker 5.3A completely, supports Game Maker 6.X Partially in Fullscreen mode, and doesn't support Game Maker 7 at all. It should also support Multimedia Fusion completely, unless the MMF Game is in Direct X mode.