ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Pignus Encryption - Pignus Encryption is an encryption platform that allows users to encrypt their messages and documents.
Tutanota - Get your encrypted mailbox for free.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.
Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.
mailbox.org - mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.