Attract-Mode is a GUI for game system emulators such as MAME, MESS and Nestopia. It abstracts the operating system, can be navigated per joystick, gamepad and spin dial. It's thus suitable for cabinet installations, works on Linux, OS X and Windows; is scriptable per Squirrel, provides a configurable menu, screensaver and background music, has a convenient history and play or score statistics.
MEWUI is a U.M.E. (MAME/MESS) user interface frontend. It extends the catalog browser, adds the full list of games, allows filtering, shows snapshots and cabinets in the selection menu, and adds an in-game mameinfo menu.