Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
pianobar - “pianobar” is a free/open-source, console-based replacement for ...
HEY - Email at its best, new from Basecamp.
SSL Enforcer - SSL Enforcer - Force SSL/TLS encryption for any browser or app. Block all unsecure connections.