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I like Fetch (pay) but it's all down to personal preference.

IMHO Finder should have FTP capabilities built in Windows Explorer stylee... for the sake of very basic getting and putting files it makes sense.
 
the ma equivalent to ftp is... ftp! in the finder, click Command + K, and type the name of the ftp server (ftp://pretendserver.com and click go. you can also use mozilla firefox if you're looking a an ftp client embedded in a browser.
 
FTP is a standard the same way HTTP is a standard. There are plenty of Mac FTP clients out there.

The ones that are typically mentioned (and have already been mentioned in this thread) are Cyberduck and Transmit.

One that I haven't seen mentioned yet (and that isn't out yet, but looks quite promising) is Flow.
 
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