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.
EtiC is a galaxy simulation software that generates and renders a mock galaxy for rational estimation of the number of extraterrestrial civilizations.
Stars and planets are simulated with plausible physical characteristics, based on user-adjustable parameters.
An EtiC simulation run consists to generate a galaxy disk physical stars, associate planets to the stars, and for habitable planets, simulate the life stages evolution until extinction.
A visual animation of the galaxy and user...
A collection of Java ports of open source terrain and solar system generation packages. Code has been extensively refactored, extended and documented. GPL License with exception for required libraries.
Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.
JPARSEC is a Java Package of Astronomical Resources for Standard Ephemerides Calculations, focused on accuracy, documentation, 2D/3D charts, realistic planetary rendering, and Astrophysical modeling. For source code visit http://conga.oan.es/~alonso/