GOG.com - DRM-free game store, selling both new and old titles. No clients required.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Origin - Origin is your new digital playground. It’s where you go to find the best that EA has to offer.
Playnite - Source code generated using layoutit.com
Epic Games - Computer game storefront that gives 88% of revenue to developers
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.