Orbit Xplorer
Educational orbit and gravitation simulator for high school, college and beginning university physics and astronomy. Input mass, radius, coordinates and velocity components of 2 to 10 bodies manually or by dragging and dropping predefined bodies. Then watch how the orbits evolve under the mutual... Simulations include elliptical satellite orbits, Kepler's laws, double star, geocentric and heliocentric world view, Lagrange points, gravity assist, Hohmann orbit, extrasolar planet, inner solar system.
http://www.ottisoft.com/orbitx20.exe - 3Mb - Download - Screenshot

Adastra FREESTAR
A complete and accessible astronomy experience is in store -- with real-time sky, comprehensive reports, arcsecond accuracy, and exciting features such as animation and live tracking. Adastra's powerful search encompasses planets, comets, asteroids, DSOs, and a multitude of stars, making... So when you click on an object in the sky, Adastra will bring up that object's definition in the Dictionary. ... Advance, retard, or animate the simulation's clock by years, months, days, and minutes of sidereal or solar time, tracking any selected object through the sky in both real-time or fast-forward.
http://www.skynow.com/coeli/software/adastra.zip - 4Mb - Download - Screenshot

Adastra Plus
A complete astronomy experience is in store -- with real-time sky, comprehensive reports, arcsecond accuracy, and exciting features such as animation and live orbital tracking. Adastra's powerful search encompasses planets, comets, asteroids, DSOs, and a multitude of stars, making exploration... So when you click on an object in the sky, Adastra will bring up that object's definition in the Dictionary. ... Advance, retard, or animate the simulation's clock by years, months, days, and minutes of sidereal or solar time; track any selected object through the sky in both real-time or...
http://www.skynow.com/coeli/software/astrapl.zip - 4Mb - Download - Screenshot

3D Alien Clock screensaver
For a long time we used to think that Clock is just a time-measuring tool. At the same time ingenious Alien scientists have been deeply exploring the time phenomenon and finally created Interstellar Time Factory aimed to produce the time of the highest quality. ... The Time Factory was launched into space and on June 23, 2006 reached our Solar system. ... All we need is just to live every moment to the fullest extent. ... It does not really matter what we do or where we go if we are cheerful we do not waste our time.
http://7art-screensavers.com/files/AlienClock3Dinst.exe - 9Mb - Download - Screenshot

C88
C88 is an informational tool for amateur astronomers. It provides detailed informations about the celestial sphere objects, visible with naked eyes and for the use of an eyepiece of a modest amateur telescope to observe deep sky objects. Complex informations about the planets, sun and moon... The "solar system section" of C88 gives informations about the pysical, observational and optical parameters of the planets as well as it's orbital and rotational data. ... C88 bases on the extensive data of the Bright Star Catalogue (9110 entries) and of the Saguaro Astronomy Club Deep Sky Database...
http://www.alcyone.de/c88/c8812.zip - 11Mb - Download - Screenshot

StarStrider screen saver
Turn the StarStrider 3D planetarium into a screen saver! The StarStrider screen saver allows you to use FMJ-Software's StarStrider planetarium software as the pinnacle of 'space travel screen savers'. View the planets and moons of our solar system! View hundreds of thousands of stars! ... All in photo-realistic 3D - there's really nothing else quite like it! ... Net as stars25. ... zip) + DirectX 8 or later. ... x (Shareware available from Simtel. ... View spectacular galaxies, clusters & nebulae!
http://www.starstrider.com/download/starsv20.zip - 222Kb - Download - Screenshot

365 Hubble Telescope Screen Saver
Launch yourself into orbit and discover the WONDERS OF SPACE through the eyes of the world-famous Hubble Space Telescope. This space screensaver includes over forty INCREDIBLY DETAILED IMAGES of spinning galaxies, colorful nebulae, distant supernova remnants, solar system planets, and other... Take your mind to the heavens every time your computer is left idle! ... com screen savers come with STICKY NOTE support so you can leave an on-screen message while you are away from your computer and WALLPAPER support so you can use any screensaver image as your desktop background.
http://365multimedia.com/cart/download~asp-shareware~hts.exe - 7Mb - Download - Screenshot

Coeli - Stella 2000
Complete astronomy suite comprising a full-featured planetarium, observing log and list builder, Coeli Time Line, Live Orbits (orrery), location browser, Sky Quiz, and sophisticated searches embracing planets, comets, asteroids, DSOs, and up to 300,000 stars. ... An integral HTML guide to the solar system, a 1000-term astronomical dictionary, and the 2nd revised and enlarged edition of Aspects of Astronomy -- a book-length primer covering topics such as "What are the Stars? ... Stella provides direct links to extensive DSO and planetary information on the Web, all tightly unified with...
http://www.coeli.com/software/stella.zip - 4Mb - Download - Screenshot

Universal Scientific Calculator
A Super Calculator, many maths functions, charts, 20 educational and ludic games. Math Functions: sin, cos, tan, asin, acos, atan, x2, 1/x, root, %, log, exp, pi, hyperbolic x^y, secant, asec, cotang. Factorization. Financal: expiries, capital, rate, currencies... ... Pi decimals (10000), Chaotic Pendule simulation, Solar System Simulation, other games (invaders, blocs, balls, billard, ... ... Amounts in letters... ... Calculations in radians and degrees. ... Planets ephemerids, Jupiter Satellites, Triangle Geometry (Euler and Simson lines, ...
http://www.1dustrie.com/calc.msi - 6Mb - Download - Screenshot

Astro Gemini _Collection CD complete
Astro Gemini Software is happy to offer you a selection of great animated 3D screensavers. They have been arranged into several outstanding theme collections and are now available on CDs! Benefits of getting our screensavers on CD: CD prices are significantly lower than the regular prices for... Fish Aquarium 3D Screensaver Green Valley 3D Screensaver 3D Waterfall Screensaver Lighthouse 3D Screensaver 3D Bungalow Aquarium Screensaver Forest Life 3D Screensaver Winter 3D Screensaver Christmas Time 3D Screensaver Solar System 3D Screensaver Planet Earth 3D Screensaver Star Wars 3D...
http://urlcut.com/astrogeminicll.exe - 3Mb - Download - Screenshot