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.
Easy Vault - Easy Vault: Hide Pictures, Videos, Gallery, Files is an all-in-one privacy protection application designed for those who want to lock and hide their private files.
Advanced File Security Basic - Download Advanced File Security Basic. Protect files by encrypting them with a strong password, a series of questions, or even an USB key you can carry around with this powerful security solution
Wise Folder Hider - Wise Folder Hider is a free file/folder hiding tool.