Roundcube - Web-based IMAP email client
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
HEY - Email at its best, new from Basecamp.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.