Drauger OS - Drauger OS is an Ubuntu-based Linux desktop gaming distribution that ships with many modifications and optimizations over stock Ubuntu that are intended to improve gaming performance and the gaming experience.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Lakka - Lakka is the official Linux distribution of RetroArch and the libretro ecosystem.
Playnite - Source code generated using layoutit.com
ChimeraOS - Steam, Epic, GOG, retro consoles, and more... all from your couch
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.