ScummVM - Game engine recreation of SCUMM made by LucasArts.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
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.
ZSNES - ZSNES is a Super Nintendo Entertainment System emulator.
Batocera.linux - Batocera.linux is an open-source and completely free retro-gaming distribution that can be copied to a USB stick or an SD card with the aim of turning any computer/nano computer into a gaming console during a game or permanently.