Gravitorium Pro 

The prime purpose of Gravitorium is to let you play with ideas about gravity and gravitational systems. Create an entirely new solar system from scratch!
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EasySky 

Astronomy software, shows you the complete night sky (340,000 stars) and our solar system in a 3D orrery view with the planets, asteroids, and comets from any place at any time. Many animation options, printing.
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1st Light 3D Solar System Simulator 

1st Light is a fully interactive 3D solar system creation tool and screensaver. The free version allows users to view and load any solar system. The paid version allows users to create their own solar system with any texture and # of planets.
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Orbit Xplorer 

Educational orbit and gravitation simulator for high school, college and beginning university physics and astronomy. Easily create, run, print and save a simulation. Includes 29 premade simulations with activities page in html-format.
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Adastra FREESTAR 

Experience accessible astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live tracking.
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Adastra Plus 

Experience complete astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live orbit-tracking. Sky Quiz and two encyclopedic reference sources are interactively linked to the sky display
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