Latest version of open source (free) FTP utility by David Kocher. Not as fast as Yummy or as simple as Transmit but worthy and priced right.

FTP, SFTP, WebDAV and Amazon S3 browser… with an easy to use interface, integration with external editors and support for many Mac OS X system technologies such as Spotlight, Bonjour, Quick Look and the Keychain.

9WR - Cyberduck: Free FTP, WebDAV, Amazon S3 browser, many languages, features.