FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
Sync.com - Sync. com offers a backup tool and a file sharing service, rolled into one.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
Zoho WorkDrive - File storage & content collaboration tool for modern teams
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Yandex.Disk - Files on Yandex.Disk won't get lost if your phone or computer breaks.