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HTTPS Everywhere - Chrome extension that encrypts and secures your browser
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.
Crypteron Community Edition - Encryption and key management for C# and Java
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
pianobar - “pianobar” is a free/open-source, console-based replacement for ...
Keybase Chat - End-to-end encrypted chat built into Keybase