GLsat
Science, Astronomy, Amateur, Satellites - GLsat. 3D satellite tracking and visualization utility written in C++ using OpenGL, calculates current position, and displays position around the earth.
https://glsat.sourceforge.net/
Astrospider Home Pages
Science, Astronomy, Amateur, Satellites - AstroSpider. Solar system and deep sky galleries, remote images, images of satellites, and equipment information.
http://astrospider.com/
Northern Lights Software Associates
Science, Astronomy, Amateur, Satellites - Northern Lights Software Associates. A windows-based program with real time tracking of an unlimited number of satellites.
http://www.nlsa.com