Element (previously Riot.im) is a libre instant messaging client based on the Matrix protocol. It includes text chats, audio/video calls and file transfers.
The Matrix protocol has a federated design and allows bridges to other communication apps. Furthermore, anyone can set up their own Matrix server and use it to collaborate with other people’s Matrix servers.
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Mumble is an open-source low latency, high quality voice chat application. It also has text chats and is popular amongst gamers and podcasters.
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