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Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
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.
blockslack.io - Chat for small teams — encrypted and decentralized
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Messenger Platform - Discovery, chat extensions, and richer experiences
Keybase Chat - End-to-end encrypted chat built into Keybase