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...
DBGL - DBGL is a free, open source, multiple frontends for DOSBox.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
DOSBox Launcher - DOSBox Launcher is a multi-platform GUI frontend for DOSBox.