itch.io - An online game marketplace and community.
GOG Galaxy - Truly gamer friendly, DRM-free online gaming platform.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Ubisoft Club - Ubisoft Club app enables you to get updates about your favorite games timely.
Lutris - Lutris is an open source gaming platform for GNU/Linux.
Origin - Origin is your new digital playground. It’s where you go to find the best that EA has to offer.