CounterMail - Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy.
Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.
Inbox.lv - Inbox.lv Mail
GPGTools - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
Webmail.ca.za - Free email, file storage, sms and more.
Lockbin - Lockbin is a web application for sending private email messages and files.