Maybe Midnight Commander? It can open FTP-connections (and shell connections, too, allowing secure copying of files over SSH rather than FTP), has that well-kno

Maybe Midnight Commander? It can open FTP-connections (and shell connections, too, allowing secure copying of files over SSH rather than FTP), has that well-known dual pane layout, and, while not a GUI application, can be controlled the same way a GUI application can without even needing X. :)