Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
Sync.com - Sync. com offers a backup tool and a file sharing service, rolled into one.
Dropbox - Online Sync and File Sharing
Yandex.Disk - Files on Yandex.Disk won't get lost if your phone or computer breaks.
Microsoft OneDrive - Secure access, sharing & file storage
Zoho WorkDrive - File storage & content collaboration tool for modern teams