Satellite Toolkit is a software package developed by Analytical Graphics, Inc.
Their website is:
http://www.stk.com/ (outside UND website)
<>The Orbiter Space Simulator is a software package developed and copyrighted by Martin Schweiger. The Orbiter webpage is at: www.orbitersim.com (external, non-UND website)
The UND Space Simulator also uses Orbiter add-on packages provided by third parties.
Currently the UND Space Simulator uses Mercury and Gemini add-ons packages developed by Robert Conley. More information about these add-ons can be found at: http://www.ibiblio.org/mscorbit/ (external, non-UND website)
The X-Plane is a flight simulator developed by Austin Meyer of Laminar Research.
Its website is http://x-plane.com/
(external, non-UND website)