AstroPy - [open source - multiplatform] Development and integration of tools and numerical algorithms into the Python scripting language.

dObjects - [commercial, demo available - Win95/NT] Astronomical database and observing planner/log. Includes references to popular astronomical magazines, books, and Internet resources.

Eyepiece - [freeware - DOS] Helps determine the appropriate eyepiece for specific sky objects (double stars, nebulae, and galaxies), assists in selecting nebular filters, and performs prime-focus astrophotography calculations. Many images are included. Mouse, VGA graphics, 386 & above CPU req'd.

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.

STD Aurora Monitor Software - [commercial - Win95/98/NT/2000] Advanced auroral activity monitoring software.

PyEphem - [open source - multiplatform] A module for performing astronomical computations using the Python scripting language.

Dark Skies - [freeware - Windows] Allows you to determine which nights of the year (or month) will be totally dark (i.e. moon is not in the sky). This application will be of primary use to amateur astronomers.

LX200 remote control software - [Commercial, free demo, Win95/98] Get most features from your LX200 telescope keypad hand controller directly on your PC.

Deep-Sky Planner - [commercial - Win95/98/NT] An easy-to-use astronomical observing, imaging, and photography planning tool.

NGCView - [commercial, demo available - Win95/98/NT] Astronomical Observation Suite - Astronomical observation and logging software.

SkySight - [commercial, Win/Mac] CCD camera control and image processing, includes SkyChart III.

Calendar software - [open source - mainly Windows] Visual Basic routines that create sundials and calendars, see the dates and names of the year's moons, calculate Easter, and much more.

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, but it goes beyond traditional almanacs by enabling you to calculate data for specified locations at specified times within a fifteen year interval (1990-2005).

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

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.

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.

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.

The Sun API - [commercial & freeware - Windows] A library of functions for calculating key solar parameters for solar design including sundials.

My Astronomy Stuff - [open source - multiplatform] Java code that performs a variety of astronomical functions.

Moonclock - [shareware - MacOS] Real-time graphical representation of the lunar visual aspect for any time/date/location. Elongation, PA bright limb, RA, DEC, percent illuminated, alt/az, heliocentric lat/long, distance, radius, etc.

Nianhua Scholar Chinese Calendar Converter - [commercial, demo available - Windows] Includes Julian Day number, Julian and Gregorian calendar date, and day of year, day of week, Chinese lunar-solar calendar year month day hour, Dynasty Emperor Personal, Reign and Temple names and year.

AstroNotes - [commercial - Windows] A tool for recording observations and planning future observing sessions. It allows tracking of progress on common amateur observing programs (Messier, Herschel, etc).

C88 - an informational tool for amateur astronomers - C88 provides detailed informations 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.

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.