Cyberduck is a great FTP application, it can also do a host of other things.
easy to use interface with quickly accessible bookmarks. The outline view of the browser allows to browse large folder structures efficiently and you can quickly preview files with Quick Look. To edit files, a seamless integration with several external editors makes it easy to change content quickly.
It is open source which means a lot of people have contributed their knowledge and time for free, so donations welcome.
Click on Buy It Now to get the download, no purchase necessary.