Satellite tracking software
Earth orbits and satellite coverage display in 3D on your laptop.
Collimation Circles, app for easy telescope collimation
Night Vision is a "planetarium" program written in Java
Fortran library to compute positions of celestial bodies
A free, fast and accurate routine to compute the position of the Sun
*nix Sidereal Clock
Command-line tools for astronomy and astrophysics
ProStack - a platform for image processing and analysis
Open Source Astronomy Tools
BoPlanets shows planets relatively to an observing planet.
A tool for planning and logging your astronomical observations.
Hunting Planets in the Kepler Data
INDI C# Client