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Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Twinme - Twinme – Private Messenger is a free, secure, instant, and high-definition messaging app that protects your privacy along with giving you full control over each of your relationships and contents.
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.
Textra - Textra is a seriously beautiful, feature rich SMS and MMS app.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Material Messaging - Material Messaging is a beautiful communication app that lets you send and receive SMS and MMS messages using the intuitive interface while giving you complete control over every aspect of your messaging experience.