HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
SSL Enforcer - SSL Enforcer - Force SSL/TLS encryption for any browser or app. Block all unsecure connections.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
HEY - Email at its best, new from Basecamp.