"A good consulting tool for astrology and astronomy fans."
Astrology and astronomy fans (the two are intricately related) should take a look at Astrolog. It is a simple to use astrological calculating tool.
Via Astrolog you can make wheels, progressions, simple interpretations and illustrations of stars and constellations, analyze planetary orbits, signs of the zodiac, asteroids, heavenly bodies and many other things related to astronomy and futurology.
Astrolog is a completely free application that doesn´t take up much space on your hard drive: a little over half a megabyte.