1)   Adastra FREESTAR 4.02
Experience accessible astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live tracking.
astronomy, astro, astronomical, planetarium, sky, skymap, star map, celestial atlas, coeli, stella,

 2)   Coeli - Stella 2000 6.0.3.1
Complete astronomy software suite exploring realistic skies in real time, with observing log, Live Orbits, Sky Quiz, spoken guidance, A-Z encyclopedia, and a concentrated search embracing planets, comets, asteroids, DSOs, and 300,000 stars.
Astronomy, Planetarium, Sky Simulator, Orrery, Atlas, Skymap, Starmap, Stars, Planets, Comets,

 3)   EasySky 3.01.15
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. Many animation options, printing.
Astronomy, Planetarium, Stars, Asteroids, Comets, Orrery, Planets,

 4)   Shooting Stars Screensaver 1.1
The free screensaver, Shooting Stars, was created by RateMyScreensaver.com and contains 20 high resolution images of Comets. A comet is a small body in the solar system that orbits the Sun and exhibits a coma (or atmosphere) and/or a tail.
Free screensaver, Free screensavers, Screensavers, Space, Comets,