ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
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).
Tutanota - Get your encrypted mailbox for free.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.