Syncthing is a great open source product that delivers what it intends to, free, open source syncing across multiple computers and platforms. It works well but it does have some challenges including not being as easy to use as many of the non-open source alternatives. Where is does shine is when you need an easy to use sync service for multiple computers running different operating systems.
not rated $0.00 Free Open Source Visit Site
StableBit CloudDrive
StableBit CloudDrive
StableBit CloudDrive creates a virtual hard drive that acts and behaves like a real physical hard drive. The cloud drive can be located on one of several cloud storage providers or on a local drive giving you the benefit of trust no one encryption on a local drive. Currently supports
  • Amazon S3
  • Box
  • Dropbox
  • File Share
  • FTP
  • Google Cloud Storage
  • Google Drive
  • Local Disk
  • Microsoft Azure Storage
  • OneDrive
  • OneDrive for Business
not rated $39.95 $34.95 while still in beta Visit Site