FREE CyberDuck, cyberduck.io
Cyberduck costs £16.99 from the Mac App Store, yet it’s available for free (or with a donation) from its website. It’s used to transfer files to and from FTP, SFTP, and WebDAV servers, and to Amazon CloudFront and S3, Google Cloud Storage and Rackspace Cloud Files. Servers can be bookmarked and added to Finder for quick access, and files can be edited directly from a server. There’s no two-pane view of local and remote files, but the app is otherwise excellent.