PuTTY (A free Telnet/SSH Client)

PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. Acting as a client program for the SSH, Telnet and Rlogin network protocols PuTTY provides the ability to establish a remote connection over a network. PuTTY implements the client end of that session.

WinSCP (Free SFTP and FTP client for Windows)

WinSCP for Windows makes it easy and convenient to transfer files between your local computer and the remote host computer (server). You can upload and download files by using an intuitive, graphical user interface similar in functionality to Windows Explorer.