Playnite, Lutris, Epic Games Store, itch.io, Heroic Games Launcher, GameTrack, Kinguin, Spark Console, Legendary, Rockstar Games Launcher, GameVault, Game Jolt, GameHub, Pegasus, Athenaeum - Arcadia, FreeToGame, Bethesda Launcher, RetroAchievements.org, Cdkeybay.com, Sila Games are some alternatives to GOG GALAXY.