http://www.inputdirector.com/ Is a Windows application that lets you control multiple Windows systems using the keyboard/mouse attached to one computer.
http://synergy-project.org/ Brings your computers together in one cohesive experience; its software for sharing one mouse and keyboard between multiple computers on your desk. It works on Windows, Mac OS X and Linux allowing you to seamlessly move your mouse cursor between all computers on your desk.
http://www.microsoft.com/en-us/download/details.aspx?id=35460 Mouse without Borders is a product that makes you the captain of your computer fleet by allowing you to control up to four computers from a single mouse and keyboard. This means that with Mouse without Borders you can copy text or drag and drop files across computers.
http://www.keyboard-and-mouse-sharing.com/ Lets you share your mouse and keyboard with multiple networked computers.
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