Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Exocet - Exocet creates a Folder on your System.
M3 Bitlocker Loader - Read/write Bitlocker encrypted drive in macOS/Mac OS X and Linux
R-Crypto - R-Crypto is smart data security and disk encryption software that allows you to secure your sensitive information via strong encryption.
OpenPuff - OpenPuff is a professional steganography tool: HW seeded random number generator (CSPRNG)