osXigen is a powerful queue-based FTP client for Mac OS X. It's multi-threaded and feature rich. It supports Web site mirroring and synchronization, active bookmarks, and filters. It supports most FTP servers and comes with an FTP protocol helper. It also offers full BBEdit integration in an easy-to-use user interface. You're also likely to enjoy the audio alerts and the ability to list hidden files on servers.
Version 3.0b1: Release notes were unavailable when this listing was updated.
Mac OS X 10.3.9 or later