Roms Mania - A working online resource for roms.
AmpShell - AmpShell is a DOSBox front-end for Windows.
Gamulator - Gamulator is the n.1 place to find and download all the retro roms, iso's and games for your arcade emulator.
Terminal Launch V - For those that want a clean, simple fast emu frontend.
CoolROM - Download from the largest and cleanest ROMs and emulators resource on the net. Mobile optimized. Systems include N64, GBA, SNES, NDS, GBC, NES, MAME, PSX, Gamecube and more.
DBGL - DBGL is a free, open source, multiple frontends for DOSBox.