Skype
Freemium
Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Bit Chat
Open Source
Bit Chat is a secure, peer-to-peer, open source instant messenger with end-to-end encryption.
Tox
Open Source
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.
TeamSpeak
Freemium
TeamSpeak is software for quality voice communication via the Internet.
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Compare Mumble with alternatives
Compare Dialog Messenger and Mumble and decide which is most suitable for you.