Tox
Open Source
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.
Signal
Open Source
Signal is the most scalable encryption tool.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Compare RetroShare with alternatives
Compare Dialog Messenger and RetroShare and decide which is most suitable for you.