BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Mega - Secure File Storage and collaboration
Userscloud - Userscloud is a free cloud service that offers unlimited online storage, remote backup capacity, fast uploading, and downloading tools.
Google Drive - Access and sync your files anywhere
Subyshare - Subyshare.
Cryptomator - When it comes to saving your files on a cloud server, it is important to ensure the security of those files. Keeping your delicate files out of the wrong hands can save you a lot of time and hassle. Read more about Cryptomator.