Cyberduck is an open source FTP client. With an easy to use interface, connect to FTP (File Transfer Protocol), SFTP (SSH Secure File Transfer), WebDAV (Web-based Distributed Authoring and Versioning), Amazon S3, Google Storage, Windows Azure, Rackspace Cloud Files and even Google Docs. Cyberduck includes a bookmark manager and supports the Mac OS X Keychain and Bonjour networking. 36 languages. Portable only for Mac, in Jan. 2012 not for Windows More info »
The best ftp on windows for sure. If you are fillezilla user it will be so easy to jump with import to cyberduck.
I think this is the best FTP-and-more browser ever, although I have not tried Transmission. But Cyberduck is free and open source, so I have no need to look for more. I love it.
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