BoPlanets shows planets relatively to an observing planet.
GPL software which renders realistic skies in real time
Hallo Northern Sky planetarium program
Virtual Planetarium and other Astronomical Calculation Routines
Night Vision is a "planetarium" program written in Java
A java 3d simple virtual celestial globe. Source code available
A planetarium software that shows a 3D simulation of the night sky
A software for ATM telescope automation
Astronomical planetarium SW
Software for instrumenting a Dobsonian telescope
A virtual planetarium for observers of the real sky.