PuTTY, WinSCP

PuTTY: A Free Telnet/SSH Client
http://www.chiark.greenend.org.uk/~sgtatham/putty/

WinSCP
Free SFTP, SCP and FTP client for Windows
http://winscp.net

psftplib
A python wrapper for psftp (sftp) that mimics the ftplib interface.
https://code.google.com/p/psftplib/