The Emulation Realm

Attract-Mode  Attract-Mode (Source)

"Attract-Mode is a graphical front-end for command line emulators such as MAME, MESS and Nestopia. It hides the underlying operating system and is intended to be controlled with a joystick, gamepad or spin dial, making it ideal for use in arcade cabinet setups. Attract-Mode is open source and runs on Linux, Mac OS-X and Windows."