ORSA 0.7.0 (by Pasquale Tricarico)
ORSA is an interactive tool for scientific grade Celestial Mechanics computations

ORSA 0.7.0 (by Pasquale Tricarico)
ORSA is an interactive tool for scientific grade Celestial Mechanics computations

Xplns 3.3.1 (by Osamu Ajiki)
Xplns reproduces real starry sky on your display of X Window System

BOTEC 0.3.4 (by Erik Max Francis)
BOTEC project is a simple astrophysical and orbital mechanics calculator, including a database of all named Solar System objects.

PyEphem 3.7b (by Brandon Craig Rhodes)

TerraJ 0.2 Beta (by Martin Smith)
TerraJ is a Java port of fractal terrain and simulated solar system generation programs.

The porting has included extensive refact

Planets 3D 1.3 (by Benjamin Mesing)
The purpose of Planets 3D is to show a simulation of our solar system

KStars 1.2 (by Jason Harris)
KStars is a Desktop Planetarium for KDE

Solar Imperium 1.6.4 (by Yanick Bourbeau)
Solar Imperium is a Solar Realms Elite clone

TRIP 0.98.74 (by J. Laskar and Mickael Gastineau)
TRIP is a general computer algebra system dedicated to celestial mechanics

DX Toolbox 4.1.1 (by Black Cat Systems)
DX Toolbox searches the web for you, gathering information on solar and geomagnetic conditions that affect radio propagation.

It a

Xplanet 1.2.0 (by Hari Nair)
Xplanet was inspired by Xearth, which renders an image of the earth into the X root window

Stellarium 0.8.1 (by Fabien Ch?reau)
Stellarium is a free GPL software which renders realistic skies in real time with ope

Mars Simulation Project 2.79 (by Scott Davis)
Mars Simulation Project is a free software Java project to create a simulation of future human settlement of Mars.

The simulation

Gnome Predict 0.5.99.5 (by Alexandru Csete)
Gnome Predict or Gpredict is a satellite tracking program for Unix-like operating systems

KStars 1.2 (by Jason Harris)
KStars is a Desktop Planetarium for KDE