A list of FTP client applications.
The free FTP solution from Mozilla (the guys that make FireFox web browser). I recommend this application for everyone. It works both on a Mac (OSX 10.4.11 needed, and you might have to find the older version) and PC. The user interface is very user friendly, can save your settings for an easy re-connect, and does a great job of visually representing the local computer (on the left) and the remote server (on the right). Most people can stop reading right here.