Cyberduck

Product: Cyberduck v4.0.2
Company: swiss made software
Website: http://cyberduck.ch
Type: Free
Requirements: Windows XP/Vista/7

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.