Synergie Lets you share your keyboard and mouse with several OS

For Windows, Linux and OSX Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems, each with its own display, without special hardware. It's intended for users with multiple computers on their desk since each system uses its own display. Redirecting the mouse and keyboard is as simple as moving the mouse off the edge of your screen. Synergy also merges the clipboards of all the systems into one, allowing cut-and-paste between systems. Furthermore, it synchronizes screen savers so they all start and stop together and, if screen locking is enabled, only one screen requires a password to unlock them all. Synergy is open source and released under the GNU Public License (GPL). Please see doc/index.html for more information.

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hsm01 (2010-05-21)

Windows
On Windows run synergy by double clicking on the synergy file. This brings up a dialog. Configure the client:
Click the Use another computer's shared keyboard and mouse (client) radio button
Enter the server's computer name next to Other Computer's Host Name
This is not the server's screen name, unless you made that the server's host name as recommended
If the client's screen name is not the client's computer name:
Click Advanced...
Enter the client's screen name next to Screen Name
Click OK
Now click Test.