RetroArch - RetroArch is a frontend for emulators, game engines and media players.
MESS - Emulates most gaming systems that exist, emphasizing accuracy over speed.
Yabause - Yabause is a Sega Saturn emulator under the GNU GPL.
Bottlenose - Bottlenose is a high quality front-end companion app for video game emulators!
Mednafen - Mednafen is a portable, utilizing OpenGL and SDL, argument(command-line)-driven multi-system...
Mini vMac - The Mini vMac emulator collection allows modern computers to run software made for early Macintosh...