Comet
The comet screensaver displays a comet swooping over your screen, lighting up your darkened desktop. With the Fiery Comet option you can set the comet on fire, Turbulence let's you add turbulence to the comet and it's tail and with Screen Burn you can simulate what a screensaver is not supposed...
http://www.xs4all.nl/~remcodek/zip/comet.zip - 161Kb - Download - Screenshot

Planet's Orbits
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 most noteworthy functions are date specification (past, future), 2D/3D orbital animation and custom zoom, orbits of 10000+ asteroids and comets from different databases, simple database handling and updates, printing, statistic, and information windows.
http://www.alcyone.de/POrbits/po17.exe - 15Mb - Download - Screenshot

EasySky
Astronomy software, shows you the complete night sky (340,000 stars) and our solar system in a 3D orrery view with the planets, asteroids, and comets from any place at any time. All settings can be saved in different documents. Animations let you understand the motions of the celestial bodies or... The demo version contains less objects and some minor restrictions. ... Printing.
http://www.easysky.de/eng/download/esd30115eng.exe - 6Mb - Download - Screenshot

Tetris5000
The EleFun Multimedia Company has released Tetris 5000 - a remake of the most famous game in the world Tetris. The game has many advantages and is really worth playing. It has perfect and fascinating gameplay of a classical Tetris, as well as many other unique features. ... Two caudate comets are fluttering along the edges of the game field. ... The moment you put together the whole row or several rows, the comets rush into the game field and whole rows disappear in blazing enchanting flashes. ... They possess positive energy and do not make disharmony.
http://download.elefun-desktops.com/Tetris5000.exe - 4Mb - Download - Screenshot

Tetpic5000
The EleFun Multimedia Company has released Tetpic 5000 - a remake of the most famous game in the world Tetris. The game has many advantages and is really worth playing. It has perfect and fascinating gameplay of a classical Tetris, as well as many other unique features. ... Two caudate comets are fluttering along the edges of the game field. ... The moment you put together the whole row or several rows, the comets rush into the game field and whole rows disappear in blazing enchanting flashes. ... They possess positive energy and do not make disharmony.
http://download.elefun-desktops.com/Tetpic5000.exe - 6Mb - Download - Screenshot

All Space
This screensaver shows a selection of the images available in our outer Space Series screensavers: American Space Shuttle, Deep Space, Solar System, and Spacecraft. These images include nebulae, galaxies, planets, moons, comets, asteroids, interplanetary probes, space stations, satellites, and... This screen saver contains 63 amazing images.
http://www.soft2d.com/graphics_&_m...eensavers/files/allspa30trial.exe - 2Mb - Download - Screenshot

New Frontiers
This CD-ROM celebration of space, and those who seek to conquer it, is the premier screen saver and desktop photo collection, including over 400 full-color NASA photographs from historic satellite, orbital and lunar missions. Spectacular shots include shuttle lift-offs, Magellan space probe...
http://ftp.rissnet.com/screensavers/newfrntr.zip - 23Kb - Download - Screenshot

Acamar Rising
Acamar Rising is a 3D space shooter where a lone fighter must defend a space station against the many threats of space, from asteroids to aliens. The fighter pilot who defends the station may be lone, but he isn? t without some hefty resources at his disposal. ... Assaulting the station is a variety of threats, the most common of which are asteroids and comets, which hurtle towards the station. ... Let too many of these items past and there won? ... Also alien crafts will continuously assault and harass the defenses, along with the occasional mother ship.
http://www.beteogames.com/acamar/AcamarSetup.exe - 16Mb - 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

Happy Note! Notes In Space
Happy Note! Notes in Space is a full-fledged arcade-type computer game that's both fun and educational. It will teach you about relative note durations (whole notes, half notes, quarter notes) even as you play and have fun. You'll be shooting at space faring notes from your very own spaceship. ... For now, let's just say that you can gain extra lives by shooting down comets, and lose them almost as fast if a meteor collides with your spaceship. ... Play the game and find out! ... With its three levels of difficulty (Beginner, Advanced, Expert) and other options, Happy Note!
http://perso.club-internet.fr/priben/nospaus.exe - 2Mb - Download - Screenshot