Game Center - Game Center brings social gaming to OS X and iOS apps.
MEGPlay - Where gamers gather. MEGPlay is the hub for esports and gaming communities across SouthEast Asia. Meet Gamers, Join Esports Communities, Get Sponsorships, Win Cash Competitions
Nakama - Nakama is an open-source distributed social and realtime server for games and apps.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
TeamTalk - TeamTalk 4 is a conferencing system which enables a group of people to collaborate and share...
Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...