Planet Saturn 3D Screensaver
Saturn is a large gas planet with an atmosphere composed of hydrogen and helium. It has the lowest density of any planet in our solar system. In fact its density is so low that it would float if it was placed in water! Visually, Saturn is flattened at the poles, due to the quick rotation on its... They are mainly composed of water ice and dust. ... Planet Saturn 3D Screensaver is an extraordinary 3D representation of this fascinating ringed planet. ... Saturn is known for its extensive ring system which is formed by a thousand individual rings.
http://www.space-screensavers.com/files/planetsaturn3d.exe - 2Mb - Download - Screenshot

Planet Uranus 3D Screensaver
Uranus is unique in our solar system because it is tilted 98 degrees. When viewed from Earth, it appears to rotate on its side! At different times throughout its orbit, we can actually view one of the planet's poles head-on. The atmosphere is composed of hydrogen, helium, and methane. ... How about having the opportunity to watch this unique planet any time you like? ... All you need is this terrific Planet Uranus 3D Screensaver on your desktop! ... Uranus is the farthest planet from Earth that can be seen with the unaided eye but of course this can only happen on a clear, dark night.
http://www.space-screensavers.com/files/planeturanus3d.exe - 2Mb - 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. ... Stella provides direct links to extensive DSO and planetary information on the Web, all tightly unified with the Sky display, Reports, and the Coeli Solar Guide. ... 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...
http://www.coeli.com/software/stella.zip - 4Mb - Download - Screenshot

Grand Tour 3D
The Distant Suns-Grand Tour 3D screen saver is a high-speed full motion solar-system simulator using OpenGL technology and accelerated graphics. The positions and rotations of each of the planets and their moons are accurate to the current date and time! ... The constantly changing scenes assure and infinite variety of interplanetary vistas. ... Watch the moons of Saturn in their daily dance around the majestic ringed world or the Earth rotate under your feet. ... (As a result, this can also serve as a real-time clock.
ftp://ftp.monkeybyte.com/WinOS/ds_ss_install.EXE - 2Mb - Download - Screenshot

MaterialWorlds Simulations
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 (free worksheets provided for pendulum, Newtons cradle, terminal velocity and... With real-time visualisation of forces and velocities (as arrows on each object as they interact or are pulled around with the mouse) and scrolling graphs recording what happens, MaterialWorlds gives a real feel for how the physical world works.
http://www.materialworlds.com/download/mwinst.exe - 4Mb - Download - Screenshot

StarStrider
StarStrider is a software planetarium that utilizes the latest in 3D-technology in order to show you not only the planets and satellites of our solar system, but also the more than 100 000 stars from the Hipparcos catalogue, all in real-time 3D. You'll also find galaxies, nebulae, supernova... Made by an astronomer and a software engineer, StarStrider combines photo realism and scientific accuracy with plain fun and the esthetic enjoyment of beauty of the wonders of the universe! ... Free add-ons include an larger planet textures, and a huge database of 2 *million* stars!
http://www.starstrider.com/download/stars28.zip - 13Mb - Download - Screenshot

7art Planets ScreenSaver
7art Planets screensaver brings you 24 amazing images of the Solar system planets. The Planets shots (true color, 800x600 resolution) take turns with various original transitional effects that make your PC's screen cosmic look. The 7art Planets screensaver will help you to feel like astronauts... 7art-screensavers will remind you about some wonders of the world we are living in everytime they start. ... We do hope 7art-screensavers will help you to be somewhat more happy. ... If it is true, we will be more happy too.
http://www.7art-screensavers.com/files/PlanetsInst.exe - 1Mb - Download - Screenshot

Galaxy 3D Space Tour
If you look up into the sky on a clear dark night, far from the intrusive glow of streetlights, you will see a faint band of starlight running across the heavens - "Milky Way". It is actually the disk of our own galaxy - seen from our perspective (within the disk). ... But what if we leave our Solar System and the Galaxy on fantastic space ship and look back to our "Space Island"? ... We tried to simulate fascinating space view of the Galaxy using latest astronomical knowledge. ... Color palettes, stars distribution within spiral galactic structure, dark and glowing nebulae, position and...
http://www.fpsoftlab.com/galaxy3d.exe - 1Mb - 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. ... positions, magnitudes, sizes, spectral data, catalogue references) as well as specific data, like double/multiple star...
http://www.alcyone.de/c88/c8812.zip - 11Mb - Download - Screenshot

Planet Quest
Are we alone? It seems rather unlikely. In the last ten years astronomers have discovered over 150 planets beyond our own solar system. Soon we will know how many of them contain life. And one day there will be more charted planets than you can count. ... Planet Quest is also suitable for laptop users, providing a special "low power" mode when the battery is in use. ... Flexible music playback options are included, as well as our theme music - an original composition created by Stuart Bassett. ... Please note that Planet Quest never repeats a scene, and yet does not require advanced...
http://www.3dwonders.com/planetquest/planetquestsetup.exe - 1Mb - Download - Screenshot