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Chadder - Encrypted messaging app
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.
GrapheneOS - GrapheneOS is an open source privacy and security focused mobile OS with Android app compatibility.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Earlynote - A time-travelling messaging app
Keybase Chat - End-to-end encrypted chat built into Keybase