GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Origin - Origin is your new digital playground. It’s where you go to find the best that EA has to offer.
Instant Gaming - Instant-Gaming.com - All your favourites games for Steam, Origin, Battle.net, Uplay and Indie games up to 70% off! Digital games, Instant delivery 24/7!
Desura - Desura is a digital distribution service for gamers, putting the best games, mods and downloadable...
Gameflip - Buy and sell video games from people not companies
GameGator - Comparing prices so users can get good deals on the games they love.