Mumble was the first and is the most successful and wide spread free and open source software for VoIP. It was the first VoIP software to provide low-latency audio suitable for gaming, and at the same time was a pioneer in high audio quality at the same time.
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. A TeamSpeak user will often wear a headset with an integrated microphone.
C3 is a standalone voice and text chat application built specifically for gamers for a better overall gaming experience. Instant setup and easy channel sharing lets players spend more time communicating and less time memorizing port and server information.Discontinued
C3 move to https://overtone.app/
TeamTalk 4 is a conferencing system which enables a group of people to collaborate and share information. Every member of a group can communicate with other members in real time using both audio and video. All that is needed is a microphone and a web camera.
With GSC, you can pick from any of 14 worldwide datacenters to host your own free voice server. Get full rights to create rooms, kick and ban users, and personalize your voice server. Plus, your settings are always saved - the voice chat room doesnt disappear when you log off.Discontinued
GSC hasn't been updates since September 28th, 2009.
Meeet.at is a free web voice chat solution that works without any plugins or registration all you need is a modern Browser (Chrome recommended). Creating a channel takes only 3 seconds you don't have to register or pay any special attention.Discontinued
Website was taken down.
Mohawk Voice is a low resource, high quality VoIP program which is free to download and use. The program is supported on Windows XP, Windows Vista, and Windows 7 in 32-bit and 64-bit platforms. Mohawk is primarily used with MMORPG and FPS online games, targeting PC gamers who...Discontinued
Mohawk Voice hasn't been updated since March 4th, 2011 and the official website is no longer accessible.
ReaLiveT is a free, elegant and simple tool that helps you to communicate immediately with a group of people. Designed for players who play in an online world. Also, a social network to chat with another people and meet new people around the world.