Synergy is an open source tool that allows you to use one monitor and keyboard for multiple computers. You switch between the computers by simply moving your mouse off the side of you current screen. It even works across several operating systems, so you can quickly switch from your Linux desktop to a Windows box for example. Wow!
With synergy, all the computers on your desktop form a single virtual screen. You use the mouse and keyboard of only one of the computers while you use all of the monitors on all of the computers. You tell synergy how many screens you have and their positions relative to one another. Synergy then detects when the mouse moves off the edge of a screen and jumps it instantly to the neighboring screen. The keyboard works normally on each screen; input goes to whichever screen has the cursor.”