Tux:
https://commons.wikimedia.org/wiki/File:NewTux.svg
(c) Larry Ewing, Simon Budig und Anja Gerwinsk
©	The copyright holder of this file, Larry Ewing, allows anyone to use it for any purpose, provided that the copyright holder is properly attributed. Redistribution, derivative work, commercial use, and all other use is permitted.
Attribution: Larry Ewing

This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See version 2 and version 3 of the GNU General Public License for more details.

Computer Background:
Public Domain Computer from GNS3
