FTP Clients

CuteFTP
Globalscape(Trial version)
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CuteFtp for Mac OS X
Transmit
Panic Inc.(Trial version)
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Transmit FTP is a modern FTP application that supports a range of transfer types and services. Not only does it support FTP and SFTP, but it also allows you to transfer files to and from services like
FileZilla
Filezilla(Free)
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FileZilla: FTP made easy
Commander One
Eltima Software(Free)
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Commander One: A Powerful Dual-Pane File Manager for Mac
Flow
Extendmac(Trial version)
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Flow: An FTP client built specifically for Leopard
Fetch
Fetchsoftworks(Trial version)
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Complete and intuitive FTP client
PureFTPd Manager
Michael Mateas and Andrew Stern(Free)
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Secure FTP made easier
ForkLift
Binary Nights(Trial version)
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Forklift - Synchronizing Data and General Preferences
WebDrive
Southrivertech(Trial version)
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Mount an FTP server as a local device
Fugu
Michael Mateas and Andrew Stern(Free)
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Fugu: Open source SFTP for Mac