VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
SecurStick - Free portable application that lets you carry encrypted files on your USB drive.
Rohos Disk Encryption - Rohos Disk Encryption is not about encrypting the some USB sticks only, rather it contains the some additional features and functions as well to deliver the extra encryption systems for your PC.
USBCrypt - USBCrypt is the name of a highly advanced encryption software that delivers the two-step verification system to the USB holders to protect their data from unauthorized and unwanted access.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
LaCie Private-Public - First recognizable quality of this encryption system is that it is offering the state of the art encryption system in a user friendly and straight forward way.