Mac OS X only: Free FTP application Cyberduck’s 3.0 beta release adds gobs of impressive new functionality to the already excellent client, including Leopard-only features like Quick Look. Other new features include Amazon S3 and WebDAV support, Web URL support (which opens files in your browser from a corresponding URL), and the handful of already impressive features like integration with external text editors. Cyberduck continues to add innovative features that make it a viable contender to even the most popular shareware FTP clients, like Transmit. Cyberduck is free, Mac OS X only; Windows users, check out previously mentioned Filezilla.