http://filezilla-project.org/

Welcome to the homepage of FileZilla, the free FTP solution. Both a client and a server are available. FileZilla is open source software distributed free of charge under the terms of the GNU General Public License

http://cyberduck.ch/

http://www.ilovefreesoftware.com/09/featured/4-best-free-ftp-software.html

http://www.ilovefreesoftware.com/29/windows/internet/download-free-ftp-client-core-ftp.html