Free for non-commercial use.
Free FTP client
Free FTP program for Windows and Mac.
Cyberduck is a libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser for Mac and Windows.
Cross-platform FTP program
Firefox add-on gives you a FTP/SFTP client right within your browser.
Free FTP program for Windows.
FTP program
Free SFTP, SCP and FTP client for Windows.