Cloudfogger - Easy and secure encryption for the cloud. Provides security for all cloud storage services like Dropbox, OneDrive and Google Drive.
Sync.com - Sync. com offers a backup tool and a file sharing service, rolled into one.
Google Drive - Access and sync your files anywhere
Zoho WorkDrive - File storage & content collaboration tool for modern teams
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
kDrive - The most privacy-friendly online storage and file sync service. From 2 TB, hosted in Switzerland.