Cyberduck is an open source FTP client for Mac and Windows platforms. In fact, it is more than just an FTP client. Cyberduck is a complete solution for transferring, editing, distributing and bookmarking files across multiple platforms. With native support of FTP over SSL/TLS, SFTP, WebDav etc., this nifty utility allows you to manage and distribute your files on  Amazon S3, Windows Azure, Google Storage, Rackspace Cloud Files, Google Docs and of course on your own FTP location.

The interface is easy to use (simple drag-and-drop operations) and can be accessed on Windows as well as Mac operating systems. The application supports various authentication methods for secure transfers and encryption modes for password protection.

The built-in editing options allow you to edit files in any external application to make changes on-the-fly.