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XEphem

The Serious Interactive Astronomical Software Ephemeris |
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Xplns introduction

Xplns reproduces real starry sky on your display of X Window System. It calculates the position of many celestial objects (stars, galaxies, nebulae, constellations, planets, comets, etc.) very accurately. You can enjoy the past and future sky on the desk top as if you have traveled all around the world. In solar system projection mode, you can examine motion of solar objects. |
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Cartes du Ciel

This program enables you to draw sky charts according to the data of 15 catalogs of stars and nebulae, as well as plot the positions of planets, asteroids and comets. |
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CyberSky - Astronomy Software for Windows

CyberSky is an accurate, yet easy-to-use planetarium program that provides an excellent way to learn about astronomy and explore the sky visible in the distant past, the present, and the far-off future. |
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