Sputnik Screen Saver
A simple screen saver with a Sputnik cruising space. Not in orbit of Earth (as a real satellite would be), but who cares?
http://www.desktop-backgrounds.net/download/sputnik.exe - 629Kb - Download - Screenshot

DeepSpace
33 photos taken from the Hubble Space Telescope. Use this versatile screen-saver engine which rotates 33 photos of colorful deep space stars, nebulas, and galaxies and an optional soundtrack of MIDI-based tunes. Features include your choice of up to 23 transition effects, Microsoft Plus! ... Also included is a tray-based utility that lets you activate any installed Windows screen saver, change the default monitor protector, access screen-saver settings, and randomly launch a new monitor protector at regular intervals or when Windows restarts.
http://dl.winsite.com/bin/downl?1000000034573 - 3Mb - Download - Screenshot

Nebula 1
25 photos taken from the Hubble Space Telescope. Use this versatile screen-saver engine which rotates 25 photos of wildly colorful deep space nebula and an optional soundtrack of MIDI-based tunes. Features include yourchoice of up to 23 transition effects, Microsoft Plus! ... Also included is a tray-based utility that lets you activate any installed Windows screen saver, change the default monitor protector, access screen-saver settings, and randomly launch a new monitor protector at regular intervals or when Windows restarts.
http://dl.winsite.com/bin/downl?500000019067 - 2Mb - Download - Screenshot

Nebula 2
25 photos taken from the Hubble Space Telescope. Use this versatile screen-saver engine which rotates 25 photos of wildly colorful deep space nebula and an optional soundtrack of MIDI-based tunes. Features include yourchoice of up to 23 transition effects, Microsoft Plus! ... Also included is a tray-based utility that lets you activate any installed Windows screen saver, change the default monitor protector, access screen-saver settings, and randomly launch a new monitor protector at regular intervals or when Windows restarts.
http://dl.winsite.com/bin/downl?500000021370 - 2Mb - Download - Screenshot

Stars and Planets
34 photos taken from the Hubble Space Telescope. Use this versatile screen-saver engine which rotates 34 photos of wildly colorful deep space stars and planets and an optional soundtrack of MIDI-based tunes. Features include your choice of up to 23 transition effects, Microsoft Plus! ... Also included is a tray-based utility that lets you activate any installed Windows screen saver, change the default monitor protector, access screen-saver settings, and randomly launch a new monitor protector at regular intervals or when Windows restarts.
http://dl.winsite.com/bin/downl?1000000034574 - 2Mb - Download - Screenshot

CellFighter ScreenSaver
This screen saver is based on an innovative extension of the Game of Life: two rival swarms of tiny critters wage a non-stop war for the screen space. The behavior of the living armies is highly amusing and unpredictable. The screen saver insensibly adds fresh forces to each army to enliven the... An interactive version of CellFighter ScreenSaver, the game of the same name, is available for free download too, and you can purchase this game at a discounted price if you register this screen saver.
http://www.cellfighter.com/download/cf-saver.exe - 143Kb - Download - Screenshot

CT Mystified
This is my take on Microsoft's Mystify Your Mind Screen Saver. Geometric patterns move about the screen with options for number of objects and spacing.
http://camtech2000.net/Programs/ctmyst10.zip - 553Kb - Download - Screenshot

From Space to Earth - Canada Screen Saver
Protect your monitor with satellite-eye views of different parts of Canada. See pictures of Adams lake, Alberta, Newfoundland,Calgary, Clearwater Lakes, Ontario, Edmonton, Halifay, British Columbia, Montreal, Sable Island, Vancouver, Winnipeg and many more. ... This screen saver contains more than 50 photos, each of which also may be used as wallpaper. ... This 32-bit screen-saver engine rotates photos of different locations of Canada as seen on clear days from the earth's orbit. ... Also included is a screen saver control and a wallpaper control.
http://www.qwerks.com/download/7507/canada_ev.exe - 3Mb - Download - Screenshot

Awesome Cities from Space Screen Saver
A photo slideshow screen saver with beautiful NASA/JPL radar images of cities and places around the world. The false-color palettes used in these images make them beautiful to look at as well as interesting to study. All photos are 800x600 high-quality images(a 1024x768 version is also... One was on space shuttle Endeavour on mission STS-59 April 9-20, 1994. ... Other screen saver features include transition effects, black and white mode, password use, and extract photos as wallpaper, including built-in wallpaper cycling every hour or every day.
http://www.awesome-screens.com/zip/cities_from_space.zip - 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