MEAGRE is a Windows based front end for all Windows based emulators.

Including:

DOSBox
ScummVM
WinFrotz
MAME
MESS
Gameboy Advance Emulators
NES emulators*
SNES emulators*
N64 Emulators
Sega Master System emulators*
Apple II
Atari 2600 emulators
Atari 5200 emulators
Windows Based Executables

The above are built into the software but it also has the ability to add your own emulators as well.