Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Exocet - Exocet creates a Folder on your System.
Autocrypt - Convenient End-to-End Encryption for E-Mail
R-Crypto - R-Crypto is smart data security and disk encryption software that allows you to secure your sensitive information via strong encryption.
CrococryptFile - Strong file encryption tool