AstroPy
- [open source - multiplatform] Development and integration of tools and numerical algorithms into the Python scripting language.
- http://www.astro.washington.edu/owen/AstroPy.html

Automated Variable Star Observing
- [freeware - Linux] Command-line program to automate reduction of variable star CCD images.
- http://astro.corlan.net/avsomat

StarTrak
- Freeware for handheld computers to help find and track objects of the night sky.
- http://www.startrak.co.uk/

Epoch_2000 Temporal Epoch Calculator
- Excel spreadsheet calculates temporal variation in astronomic constants, obliquity of the ecliptic, and illumination angles at any specified latitude. You need only input a date or the latitude.
- http://www.jqjacobs.net/astro/epoch_2000.html

C88 - an informational tool for amateur astronomers
- C88 provides detailed information about the celestial sphere objects, visible with naked eyes and for the use of an eyepiece of a modest amateur telescope to observe deep sky objects.
- http://www.alcyone.de/c88/english/index.htm

Moon Tool
- [Windows] A desktop application that displays the times of the various phases of the moon and a picture of the current phase of the moon.
- http://www.fourmilab.ch/moontoolw/

Starchart - Star mapping software
- [opensource - POSIX] There is a sky. There are things in the sky. This program draws maps of things in the sky.
- http://starchart.sourceforge.net/

GeoAstro Applet Collection
- [commercial & freeware - multiplatform] Interactive Java applets display the position, daily and annual path of the sun and the moon, for any time and location.
- http://www.jgiesen.de/GeoAstro/GeoAstro.htm

LunarPhase
- [commercial, demo available - Win95/98/NT] A comprehensive tool for displaying a variety of information on the Moon and aspects of its behaviour.
- http://indigo.ie/~gnugent/LunarPhase

Multiyear Interactive Computer Almanac
- [commercial - DOS, Macintosh] A software system that provides high-precision astronomical data in tabular form for a wide variety of objects; it calculates much of the information tabulated in the benchmark annual publication, The Astronomical Almanac, bu
- http://www.willbell.com/almanacs/almanac_mica.htm

Calendar software
- Windows program which creates sundials and calendars, see the dates and names of the year's moons, and calculate Easter.
- http://www.blibbleblobble.co.uk/Downloads/Calendar/

SkySight
- [commercial, Win/Mac] CCD camera control and image processing, includes SkyChart III.
- http://www.southernstars.com/skysight/index.html

NGCView
- [commercial, demo available - Win95/98/NT] Astronomical Observation Suite - Astronomical observation and logging software.
- http://www.rainman-soft.com/

PyEphem
- [open source - multiplatform] A module for performing astronomical computations using the Python scripting language.
- http://www.rhodesmill.org/pyephem/

STD Aurora Monitor Software
- [commercial - Win95/98/NT/2000] Advanced auroral activity monitoring software.
- http://solar.spacew.com/aurora/

JPL Planetary and Lunar Ephemerides
- [commercial - multiplatform] This CD contains three Jet Propulsion Laboratory Planetary and Lunar Ephemerides along with a toolbox of FORTRAN subroutines that allow the user to obtain the coordinates of the Sun, Moon, and nine major planets.
- http://www.willbell.com/software/jpl.htm

Deepsky 99 - Software for Observers
- [shareware - Win95/98/NT] Deepsky 99 solves an important need for amateur and professional observers. The software allows the user to plan a productive observing session and record what was observed quickly and easily.
- http://www.deepsky2000.com/