Paessler: Easy to Use With Enterprise Power. Free Trial
A low-code dashboard makes monitoring intuitive for any admin, while scripting and custom sensors give experts full control.
You shouldn't have to choose between a monitoring tool that's easy to use and one that's powerful enough for a complex environment. PRTG's low-code interface lets any admin build dashboards, set alerts and monitor devices without scripting, while custom sensors and full API access are there when your team needs deeper control. One platform, no compromise. Download a free 30-day trial now.
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Earth orbits and satellite coverage display in 3D on your laptop.
SaVi - simulate Starlink, Iridium, Globalstar, O3b, GPS, Galileo and other satellite constellations, modify them, or design your own. Requires Tcl/Tk and Unix libraries; 3D viewing option requires Geomview running on X Window.
...http://sourceforge.net/projects/rayshade/
http://sourceforge.net/projects/rayshade-math/
http://sourceforge.net/projects/utahrastertoolkit/
NOTE: Rayshade is unmaintained so no longer competitive to povray. And neither are competitive to RADIANCE. But see homepage or examples; Rayshade has good sides: great documentation and easier radiance style file format: but no GUI for design.