This is the gold standard for Mac FTP clients.

I move a lot of files around, and have been using Transmit for years and years. Its an app I just cant be without, and I was happy to buy the latest version via the App Store. Ive tried a lot of FTP clients, some good, some not so good, but Transmit is the very best one out there.

dangerousmezzo about Transmit, v4.1.7