Stacking program, astrometric (plate) solver, fits file viewer
A planetarium software that shows a 3D simulation of the night sky
Night Vision is a "planetarium" program written in Java
Astronomical Ephemeris
A free, fast and accurate routine to compute the position of the Sun
BoPlanets shows planets relatively to an observing planet.
Sudden ionospheric distubance (SID) monitor
Calculate time ephemerides in convenient form
Simulator of planetary systems
Inverse Compton emission from heliospheres of sun and stars
Real-time 3D visualization of space
A C library of published theories of motion of solar system objects.
A fair attempt at the Keplerian tradition to explore the solar system