UkeySoft USB Encryption - Password Protect Lock your USB Disk, flash drive, memory stick
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
QuickCrypto - QuickCrypto is advanced encryption program designed for the encrypting the personal data stored in the internal and removable drives.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
BoxWrap - Encrypts and protects your files on your machine, before they hit your disk and the cloud:...
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.