Tuta

KomunikacjaGPL-3.0FreemiumWebWindowsmacOSLinuxAndroidiOS

Encrypted email service with end-to-end encryption, calendar, and contacts for secure communication

GitHub Repository Official Website

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Secure messaging app built on the Matrix protocol with end-to-end encryption and federation

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Simple and beautiful forum software with a fast, extensible, and mobile-friendly design

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Anonymous messenger requiring no phone number with decentralized network and end-to-end encryption

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