Steghide - Steghide is a steganography program that is able to hide data in various kinds of image- and...
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
OpenPuff - OpenPuff is a professional steganography tool: HW seeded random number generator (CSPRNG)
M3 Bitlocker Loader - Read/write Bitlocker encrypted drive in macOS/Mac OS X and Linux
DeepSound - DeepSound is the way of hiding your message in an audio file.
SilentEye - SilentEye is a cross-platform application design for an easy use of steganography, in this case hiding messages into pictures and sounds.