Mega - Secure File Storage and collaboration
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Userscloud - Userscloud is a free cloud service that offers unlimited online storage, remote backup capacity, fast uploading, and downloading tools.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
Subyshare - Subyshare.
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.