ThinBox (http://www.jontylovell.net/index.php?page=30) is a free, open source Linux distribution based on Raspbian, designed to turn you Raspberry Pi into a remote terminal client. ThinBox allows you to quickly and easily connect your Raspberry Pi to a Microsoft Windows based server or desktop.
Connections are easily set up using the built-in connection manager. ThinBox boots in less than 30 seconds to the desktop and has a simple, easy-to-use GUI application to set up connections. It is one of the easiest ways to use your Raspberry Pi to remotely access your systems from anywhere.