Cyberduck FTP for MacOS X

Probably the most well-touted ftp/sftp client for MacOS X, and it’s open-source! Get it here.
MacWorld

There are a few free FTP clients for the Mac, but none is as polished or as easy to use as Cyberduck.

Mark Frauenfelder of BoingBoing writes:

I’ve been using David Kocher’s Cyberduck FTP client for several months now. It’s freeware for OS X and it is fabulous. All the other FTP clients I’ve used have been hard to learn and are confusing, but I’ve never had to look at the help file for Cyberduck. I don’t even know if it has a help file.