Moot - Moot is a platform for gamers through which they can take part in gaming discussions.
itch.io - An online game marketplace and community.
Plink - Social & Matchmaking platform for gamers.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Steam Chat - Steam Chat is a chatting app for Steam users that enables them to chat through their cell phones and get updated with what is happening.
Ubisoft Club - Ubisoft Club app enables you to get updates about your favorite games timely.