Game Chat Tools
Gaming enthusiasts sometimes require software that has a slightly different focus from more mainstream computer users. This includes communication software. For video games to perform their best, these communication apps need to use minimal system resources while also providing high quality audio so you can clearly understand your friends or teammates. That’s where software like Discord comes in as a “game chat” app.
Discord
All-in-one voice, video and text chat for gamers that’s free, secure, and works on both your desktop and phone.
TeamSpeak
TeamSpeak is a proprietary Voice over IP software that allows users to speak on a chat channel with other users, much like a telephone conference call.
Xfire Client
Discontinued
The Xfire Client and the social site have been discontinued to focus efforts on The 
Xfire Tournament Platform
Xfire is a free IM application and a tool that automatically keeps track of when and where gamers are playing PC games online and lets their friends join them easily.
GameRanger
GameRanger is a free download for Mac and PC that lets you play over 600 games and demos online with friends and opponents worldwide.
Twitch Messenger
Desktop and mobile app for Twitch users to communicate with friends and teammates across platforms.
C3
Discontinued
C3 move to 
Overtone App https://overtone.app/
C3 is a standalone voice and text chat application built specifically for gamers for a better overall gaming experience.
GameVox
Discontinued
The official website and the program are no longer available.
GameVox provides group voice communications for gaming communities.
Smeet
Smeet is a virtual 3D World, where you can create your Avatar and your own Room. Start now and meet new friends, flirt, organize your party, share pictures and videos!
Curse Voice
Discontinued
Curse Client and Curse Voice joined forces to become 
Twitch Messenger
Curse Voice is a fast and free voice chat for gaming, currently in Closed Beta.