FileRunner is a two pane file manager for Unix and Unix like systems. It is simple and efficient and has a built-in FTP and SFTP client. It also does a reasonable (and improving) job on Windows systems. New and improved from a FileRunner of long ago.
FTclP is a FTPclient written in Tcl-tk. It aims to provide a lightweight, easy to use, gui-based ftpclient for several operating systems/architectures.