VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
TrueCrypt - TrueCrypt is a leading cross-platform that provides encryption tools that allow you to migrate any encrypted data to virtual disks images on your systems.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
AES Crypt - AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.