Satellite tracking software
Fortran library to compute positions of celestial bodies
*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.
Multi-platform Variable Star Visualisation and Analysis
Download and browse MSL Curiosity images
Java numerical classes for astronomy and more...
Celestial Mechanics Engine
INDI astronomical device control library for Java