Screensaver that shows a 3D random arbitrary solar system that shows planets with random orbits and textures from real solar system planets and imaginary planets around the sun. It's free of adware,ads,virus,etc... and it's freeware.

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Planet's Orbits (for Windows 98/ME/2000/XP) is an accurate digital orrery with a wealth of functionality. The program uses the DE404 ephemeris (accurate for dates between 2000 B.C. and 6000 AD) for the calculation of planetary (except Pluto) and lunar positions. The calculation of the positions of the satellites of Jupiter, Saturn, and Uranus is done by the various analytic theories given in the Explanatory Supplement to the Astronomial Almanac.

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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 introductory to advanced premade simulations with activities page in html-format. Uses actual pictures of planets. Plot orbits in a plane or in 3D. View time, distances, speeds, accelerations and energies as they change. Zoom and change parameters during the simulation.

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SimSolar - Solar System Simulator for Windows. Planet labels and orbits can be activated for easier understanding. Includes simple display and controls, speed control, tilt and rotation options for easy viewing, earth centered mode, options for scaled planet and orbit sizes, and over 150 years of range. Registered version includes moon phase display, planet images, planet information, alignment finder, and a Galilean Moons of Jupiter simulator.

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Integrated astronomy software suite exploring realistic skies in real time, with observing log, Sky Quiz, Live Orbits (orrery), telescope support, spoken pronunciation guidance, a half-million word Encyclopedia Astronomica, and concentrated searches embracing planets, comets, asteroids, DSOs, and up to 300,000 stars.

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Just try to stay on the perfectly straight race tracks! It's that simple. Sure, there are holes, ramps, loop the loops and lots of silly Chromates in the way, Oh, and a slight problem with overheating. I didn't say it was going to be easy!

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AstroGrav is a software program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system that you are viewing, while watching how it evolves with the passage of time.

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Live interactive physics simulations let you explore the Solar System (orbits, seasons, gravity, tides, satellites and comets), play snooker (on a full size table) and experiment with Laws of Motion simulations. Now with machines ( pendulum clock and siege engines) bridge, crash and ideal gas simulations and experiments.

AstroGrav is a software program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system that you are viewing, while watching how it evolves with the passage of time.