WinSCP - WinSCP is an open source free SFTP client and FTP client for Windows.
FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
PTFTP - Simplistic and intuitive explorer-like ftp client. Open source.
PyroBatchFTP - PyroBatchFTP/SFTP helps you to exchange files with internet SFTP servers in an automated way by processing scripts. e.G. to automatically update documents on web servers.
LAN-Share - LAN Share is a cross platform local area network file transfer application, built using Qt GUI...
lftp - lftp is a command-line file transfer program which besides FTP, also supports FTPS, HTTP, HTTPS...