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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.
Playnite - Source code generated using layoutit.com
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.
D-Fend Reloaded - D-Fend Reloaded is a graphical environment for DOSBox.