Plasma Widget using RubyKDE/RubyQt to manage a Synergy connection.
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 monitor(s).
Currently the widget implements basic server and client functionality for basic Synergy setups.
You'll need to have synergy, KDE 4's Ruby bindings as well as Plasma compiled with Ruby support in order to use this widget.
On Kubuntu the command
sudo apt-get install ruby-kde4 synergy
should do the trick.