Apple Game Center - Game Center brings social gaming to OS X and iOS apps.
GameTracker - GameTracker is your one-stop social network for gamers with game server stats, website plugins, and...
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Overwolf - Overwolf adds epic overlay apps to your favorite games.
Nakama - Nakama is an open-source distributed social and realtime server for games and apps.
IGDB - An open video game database