BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.
AmpShell - AmpShell is a DOSBox front-end for Windows.
Mednafen - Mednafen is a portable, utilizing OpenGL and SDL, argument(command-line)-driven multi-system...
Terminal Launch V - For those that want a clean, simple fast emu frontend.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
DBGL - DBGL is a free, open source, multiple frontends for DOSBox.