TL:DR; AnyClient is a free platform independent file transfer application that supports all major file transfer protocols including FTP/S, SFTP and WebDAV/S.
Download AnyClient Freeware - Rating: 4.72
Save2FTP is an easy-to-use FREEWARE utility intended for automatically
backing up your important data to remote FTP servers
Blade FTP is a FREE FTP client with some new and useful features. It allows you browse several FTP site at the same time, you can also create a task which makes the updating and downloading easy. You can also re-execute the history simply.
WebDrive integrates FTP, FTPS, WebDAV, SFTP, Amazon S3 or FrontPage servers into the Windows desktop by mapping a network drive letter to a server. This allows you to use your favorite applications to edit files and save them directly to the server.