C3 has been discontinued. Similar apps include Mumble, which is free and open source. Other options are TeamSpeak, Ventrilo, VoxShare and Roger Wilco. In total there are five Group Chat Apps like C3 for Windows, Linux, Mac, iPhone and iPad.
Free, open source voice chat featuring low-latency, high quality audio, secure encrypted communication, self-hosting options, in-game overlays, positional audio, scripting support, low resource usage, and robust user permission controls for gaming and collaboration.
Germany
EU
Embrace lag-free, secure voice chats with TeamSpeak, offering cross-platform compatibility and low CPU usage. Enjoy advanced audio controls, push-to-talk, in-game overlay, and security-focused privacy features, tailored for gamers seeking seamless communication.
GermanyEU
Ventrilo is a real-time voice chat software for group communications with surround sound support.
United States
VoxShare is a simple Python-based push-to-talk multicast voice chat application with a sleek modern GUI built using CustomTkinter.
Kazakhstan
Roger Wilco is a real-time voice chat technology that enhances communication among communities of users on the Internet.
