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.
Roger Wilco is a real-time voice chat technology that enhances communication among communities of users on the Internet.This app doesn't have any features at the moment.Discontinued
Roger Wilco has not been updated since March 12th, 2004.
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.
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.
Website was taken down.