Pignus Encryption - Pignus Encryption is an encryption platform that allows users to encrypt their messages and documents.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
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Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.
Sfletter - SFLetter.com protects your message and attachments by one click. Email protection from interception and unauthorized actions of the recipient.