Filezilla Gratis y muy popular:
https://filezilla-project.org/download.php?type=client
WinSCP
https://winscp.net/eng/download.php
Coffe Cup Free FTP
http://www.coffeecup.com/free-ftp/
CyberDuck
https://cyberduck.io/
FireFTP -- Para Firefoz de Mozilla
https://addons.mozilla.org/en-US/firefox/addon/fireftp/
Clasic FTP gratis para uso no comercial
http://www.nchsoftware.com/classic/
