Free FTP Clients
Portable FileZilla
Portable FileZilla allows you to carry a whole FTP client with you on an iPod, USB thumbdrive, portable hard drive or any other portable media.
SmartFTP
SmartFTP is FREE for personal and educational use.
FTP Surfer
FTP Surfer is a free FTP client for Windows.
AceFTP 3 Freeware
Version 3.00.4 - 2.3 Mb, Win XP, Me, 2000, NT, 98, 95
FTP Commander 5.90
FTP Commander is a simple and easy to use FTP client for windows.
WS_FTP LE
WS_FTP LE is the limited edition version of WS_FTP Pro, allowing multiple file transfers.
Core FTP Lite
A free FTP Client with SSL/TLS, SSH/SFTP, site to site transfers, dragdrop, browser integration, user-friendly interface(s), FTP/HTTP Proxy, Socks 4/5 support, remote file searching, queue manager, auto retry and resume of transfers, transfer bandwidth control, htaccess editing, advanced dir listings, queueing of multiple FTP transfers on multiple sites, sessions, start, stop, and resume of FTP transfers, advanced directory listings, .htaccess editing, auto s/key support, keep alive, auto-reconnect, file permissions (chmod), and much more.
LeechFTP
LeechFTP is no longer under development but can still be downloaded.
FileZilla
FileZilla is a fast FTP client for Windows with a lot of features. FileZilla Server is a reliable FTP server. (open source gpl license)
i.Ftp
i.Ftp is a little graphical FTP client originally developed for Beos, but now available for windows - source code is also available.