Space Exploration 3D Screensaver
The rings of Saturn have puzzled astronomers ever since they were discovered by Galileo in 1610, during the first telescopic observations of the night sky. Have you ever dreamed of getting a chance to see them with your own eyes? This screensaver is an outstanding 3D model of the Solar System. ... It's not only the sheer beauty but also the educational content that make Space Exploration 3D Screensaver an absolute must-have. ... You get to float through some of the best known constellations like the Big Dipper and get a great view of the Milky Way.
http://www.digimindsoft.com/spaceexpl3d.exe - 6Mb - Download - Screenshot

AstroGrav (Mac)
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... A wide variety of sample files are provided, including Solar System, space mission, and abstract systems, and these enable you to experiment with AstroGrav without having to go to the trouble of entering your own data.
http://www.astrograv.co.uk/AstroGrav.dmg - 1Mb - Download - Screenshot

AstroGrav (Windows)
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... A wide variety of sample files are provided, including Solar System, space mission, and abstract systems, and these enable you to experiment with AstroGrav without having to go to the trouble of entering your own data.
http://www.astrograv.co.uk/AstroGrav.zip - 1Mb - Download - Screenshot

euphOrbit
euphOrbit version 1. 0 is a simple tool designed to simulate the motions of planetary bodies in space. The primary design philosophy of this program was that it had to simulate asteroids speeding through our Solar System close to "true life". Initial positions of planets and asteroids are... The bodies are then plotted as they move according to the laws of gravitation.
http://mjab2002.republika.pl/setup.exe - 0b - Download - Screenshot

Saturn 3D Space Tour
Saturn's ring system makes the planet one of the most beautiful objects in the solar system. It was difficult to reflect it's beauty by computer simulation, but after a lot of experiments on cutting edge of modern 3D technologyies we have reached the target of really photo-realistic simulated... This screensaver can also be used for educational purposes. ... Ring's shadows, incredible cosmic sunrises, atmospheric refraction and many other features makes the each single frame of endless smooth animation comparable with best NASA photos!
http://www.fpsoftlab.com/saturn3d.exe - 1Mb - 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. ... It does not really matter what we do or where we go if we are cheerful we do not waste our time. ... All we need is just to live every moment to the fullest extent.
http://7art-screensavers.com/files/AlienClock3Dinst.exe - 9Mb - 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! ... x (Shareware available from Simtel. ... Net as stars25. ... zip) + DirectX 8 or later. ... Requires FMJ-Software's StarStrider v2. ... View spectacular galaxies, clusters & nebulae! ... All in photo-realistic 3D - there's really nothing else quite like it!
http://www.starstrider.com/download/starsv20.zip - 222Kb - Download - Screenshot

Alien Outbreak
Are you ready for some serious action? AlienOutbreak is the most addictive space shooter in the entire solar system. And very well may be in all other galaxies as well (we? ll find out as soon as we make the first real contact with the aliens). The game sucks in immediately and does not let go... Another important distinction from other space shooters is that AlienOutbreak lets you move up or down, in addition to the sideways movements. ... shooters. ... kill them all? ... Game graphics is truly superb and done in the best traditions of ?
http://www.beegames.com/alienoutbreak.exe - 3Mb - Download - Screenshot