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Many Computers via 1 Keyboard & Mouse

Do you have multiple computers on your desk? Synergy (synergy2.sf.net ) allows you to use the keyboard and mouse of your primary computer to control all the other computers around you. Best of all, it is free, works with Linux, OS X, and Windows.
For more info: (http://code.google.com/p/synergy-plus)
Synergy+ (synergy-plus) 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 doesn't do any encryption or Authentication. So, to secure Synergy you can either tunnel it through SSH or do like I do and configure a private VPN between your computers using OpenVPN and run Synergy over it. OpenVPN is available in most Linux distributions or you can download it directly from their site.