MobaXterm Portable is a nice and Free XServer and SSH Client offered by Mobatek. It comes in either Free or paid Pro customizable versions. This enhanced terminal for Windows ships with an embedded Portable X11 server for exporting your Linux/Unix displays. In addition the software includes network tools SSH, RDP, VNC, Telnet, Rlogin, FTP, SFTP and XDMCP for remote administration. Unix/Linux commands can also be used via GNU/Cygwin. All of this and more packed into a stand alone portable executable that can then be stored and run entirely from USB.