Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.