Best for

Developers and admins who move files between servers and cloud buckets without living in a terminal.

Why it deserves attention

Cyberduck is GPL-3.0, has been developed since the early 2000s, and handles FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure, OneDrive, Google Drive, and Dropbox in one browser-style window. It supports bookmarks, synchronization, bandwidth limits, segmented downloads, file editing with external editors, and client-side encryption through Cryptomator vaults. A companion duck CLI covers scripting, and Mountain Duck from the same team mounts remote storage as a local disk. The trade-off is that it is macOS and Windows only, the interface shows its age, and uploads are free but the project asks for donations.

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