Atomaders
This space-shooter is based upon the classical Invaders/Galaxian idea. You have to liberate your planet system from the alien invasion using your spacefighter. Player can obtain various extra-weapons and special abilities by destroying enemy cyborgs, fighters and motherships. ... Additional planet systems could be downloaded from the Internet. ... Each planet has its own cyborg types and an unique powerful boss at the last level.
http://kraisoft.com/files/atomadersdemo.exe - 9Mb - Download - Screenshot

Planet Venus 3D Screensaver
Venus is the second planet from the Sun and the sixth largest. The name comes from the Roman goddess of love and beauty. Venus has been known since prehistoric times. It is the brightest object in the sky except for the Sun and the Moon. It was long thought of as the Earth's twin. ... Planet Venus 3D Screensaver is a great 3D model of the planet that will turn your desktop into the eyepiece of a powerful telescope. ... However, little by little, scientists are trying to unlock its secrets, uncovering the mysteries of the cloud-shrouded planet.
http://www.space-screensavers.com/files/planetvenus3d.exe - 4Mb - Download - Screenshot

Planet Photo Screensaver
Photo Screensavers bring you a new dimension in presenting pictures that prompt the imagination and recall memories. While your computer is idle, five full size pictures taken from outer space will give you the opportunity to see how beautiful our planet is. ... Don't miss the chance to "fly" in outer space with Planet Screensaver.
http://www.photoscreensavers.us/Planet%20Demo.exe - 1Mb - Download - Screenshot

JoSyrux
16 planets are being attacked by the aliens. The higher the game level, the more merciless their attack becomes. Only your skillful and intelligent defense tactics will prevent them from conquering all of the planets. To do so, you need to figure out the aliens' attack strategy: indiscriminate... JoSyrux has two game modes: first, game play with the object of freeing a planet and second, game play with the object of reaching a high score.
http://www.jogames.com/ftp/josyrux_e.exe - 3Mb - Download - Screenshot

Otto Matic Demo
The year is 1957 and a fleet of flying saucers from Planet X have come to Earth. These saucers are under the control of the evil Brain Aliens who are abducting helpless human beings and taking them away to strange alien worlds to become slaves of The Giant Brain. ... To escape the planet you must also collect rocket fuel. ... While on each planet you must save as many humans as you can, but be careful because the Brain Aliens will try to abduct the humans before you can save them. ... You are Otto Matic, the robot who is given the job of saving Earth from the clutches of The Giant Brain...
ftp://ftp.ifd.com/pub/win/ottodemo_install.exe - 14Mb - Download - Screenshot

Free Space Screensaver
Would you like to see the way our planet looks from space? Download this screensaver and get a chance to visit other planets and even galaxies!
http://www.3d-screensaver-jam.com/files/freespace.exe - 2Mb - Download - Screenshot

Planet Mars 3D Screensaver
Mars has always fascinated people. Its red, fiery appearance is mysterious and intriguing. Many believed in the existence of an ancient race of Martians that appeared in numerous sci-fi stories. However with new data coming from space probes, a growing number of scientists now believe that life... The planet? ... It is a relatively small planet, with about half the diameter of Earth. ... Its surface would be a harsh place for humans, but it is more like the surface of Earth than that of any other planet.
http://www.space-screensavers.com/files/planetmars3d.exe - 3Mb - Download - Screenshot

Planets of the Solar System Screensaver
Basic planetary data in the form interesting for both kids and adults is given alongside. It is planet name and astronomical sign, distance from the Sun, dimensions, information on satellites, atmosphere and internal composition. Developers goal in creating this screensaver was to make Solar... Then wait for several days and ask what planets of Solar system your kid knows - and you are going to be surprised by the plenitude of the answer received! ... Parents simply need to install an educational screensaver on kid`s computer.
http://www.edu-saver.com/saver/solarsystem_screensaver_1024x768.exe - 3Mb - Download - Screenshot

The Earth is our homeland
Free 3D ScreenSaver. The Earth is our homeland, or third planet from the sun. We can imagine view from space on our planet, and it sight extraordinarily is beautiful!
http://freestone-group.com/download/EarthScreensaverSetup.exe - 1Mb - Download - Screenshot

Planetarium
See the brightest 2500 stars, all 88 constellations, all nine planets and the moonphase from 4713BC to 9999 AD from any location on earth. Click star on screen for detailed information. Geocentric and heliocentric views also available. Define your own five locations for quick switch. ... If you need a quick overview when and where a planet, star is, this is your perfect joice. ... Nice visuals, smooth animation, simple controls, good planet data. ... But it was downloaded for 13 years, and one of the first of its kind, especially the animantions and colors.
http://www.free-planetarium.com/download/PAD/planetarium.zip - 523Kb - Download - Screenshot