EmuExec is the right answer to make emulation on linux as simple as possible. But it is more than a simple multisystem frontend, you just have to see it by yourself.
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CabFE is a multi-emulator frontend for MAME, Daphne and other arcade games designed specifically for arcade cabinets using minimal set of controls (typically only a joystick and a few buttons) that are common on cabinets.
QUEF (QT Universal Emulator Frontend) is a GUI that supports many emulators. It
supports screenshots and configuration of emulators. It is designed to be easy to use
and extensible at the same time.
IQF is a frontend for xmame with a nice user interface. It has been tested on Linux, but hopefully works on other POSIX compliant OSes. IQF uses the ncurses library and is written for the console, not X.