Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
dmarcian - Safeguard your email from abuse
FileVault - FileVault is a method of using encryption with volumes on Mac computers.
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Barracuda Email Protection - Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.