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Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
TextSecure - Open Source security for mobile devices
qTox - A Qt graphical user interface for Tox.
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...