Cyberduck, available for both Windows and Mac OS X, is a free FTP, SFTP, WebDAV & cloud storage browser. With an easy to use interface, connect to your iPhone, iPod touch, or iPad via SSH in addition to FTP (File Transfer Protocol), SFTP (SSH Secure File Transfer), WebDAV (Web-based Distributed Authoring and Versioning), Amazon S3, Google Cloud Storage, Windows Azure, Rackspace Cloud Files, and even Google Docs.