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. ... Tiny program, but great planetarium, especially for teachers and students. ... This is the Windows version of the classic Planetarium software of 1992. ... The DOS version didn't work with todays fast computer anymore.
http://www.free-planetarium.com/download/PAD/planetarium.zip - 523Kb - 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. ... zip) + DirectX 8 or later. ... Requires FMJ-Software's StarStrider v2. ... Net as stars25. ... 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

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's Drag Mode brings complete plasticity into all your interactions with the planetarium display. ... Planetarium effects include scintillation, extinction, refraction, and precession in point source, photo plate and spotlight display styles; along with the complete Messier catalog in image icons.
http://www.coeli.com/software/stella.zip - 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

CyberSky
CyberSky is an exciting, entertaining, and educational astronomy program that transforms your personal computer into your personal planetarium. CyberSky provides an excellent way to learn about astronomy and to explore the wonders of the sky visible in the distant past, the present, and the... CyberSky's ease of use and amazing animation feature make it an innovative and motivating learning environment. ... CyberSky provides an excellent way to learn the names and positions of the stars, constellations, and deep sky objects, and to become familiar with the motions of solar system objects...
http://www.cybersky.com/csky331s.zip - 995Kb - Download - Screenshot