Build your own GPS unit
A virtual planetarium for observers of the real sky.
Logiciel de Gnomonique
Routines for wavefront propagation in IDL, Matlab, and Python
A simple N-Body simulator.
Multi-platform Variable Star Visualisation and Analysis
Collimation Circles, app for easy telescope collimation
MarsView tells you the visible longitude of Mars for a given time
Galaxy extraterrestrial life simulation
GUI for RNCColorStretch
A free, fast and accurate routine to compute the position of the Sun