C3 is a completely free to use voice and text chat application made for gamers. It was created by Vivox, who have and continue to provide integrated voice services for some of the more popular AAA games on the market. It can be used for MAC and PC.
Ranked in these QuestionsQuestion Ranking
Pro No need to host a server
The servers are provided by C3, so there is no need to host a server yourself.
Pro Completely free to use
No gimmicks or micro-transactions. C3 is completely free to download and use.
Pro Chatroom organization options
You can create channels as well as sub-channels. In addition, you can set up moderators for these chat rooms as well.
Con Busy UI
The C3 UI is busy with lots going on. There are multiple tab arrays, channel dropdowns, and many buttons. This all leaves the chat section a very small portion while it is actually the more important function.
Con Little dev support
The last time the website was updated was 2014, and there doesn't seem to be any activity by the devs lately.