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Cyberduck is a fairly popular file transfer client for Apple Mac and Microsoft Windows. It supports FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox.
Cyberduck was built by David V. Kocher, Yves Langisch, and iterate GmbH.
Cyberduck can be downloaded from https://cyberduck.io/.
Opening SSH tunnels from the external Internet into organizations has also become a common way to circumvent security policies and open backdoors. More information