RetroArch - RetroArch is a frontend for emulators, game engines and media players.
ScummVM - Game engine recreation of SCUMM made by LucasArts.
ZSNES - ZSNES is a Super Nintendo Entertainment System emulator.
DOSBox - DOSBox is a DOS-emulator that uses the SDL-library.
BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.
Mesen - Mesen is a NES/Famicom emulator and NSF player.