VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Google Drive - Access and sync your files anywhere
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
Dropbox - Online Sync and File Sharing
Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
ShareFile - Secure file sharing and sync