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.
Tutanota - Get your encrypted mailbox for free.
Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.
Encipher.it - Encrypting email with Encipher.it is a simple way to protect your sensitive data.