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Synergy is FOSS that lets you easily share a single mouse and keyboard
between multiple computers with different operating systems, without
special hardware. All you need is a LAN connection. It's intended for
users with multiple computers, where each system uses its own display.

It's very easy to set up.

The regular windows build has a gui, and quicksynergy provides a gui
for linux/osx: http://code.google.com/p/quicksynergy/

Good luck!
--Glenn