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/

AstroPy
[open source - multiplatform] Development and integration of tools and numerical algorithms into the Python scripting language.
http://lheawww.gsfc.nasa.gov/~bridgman/AstroPy/

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

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

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

LX200 remote control software
[Commercial, free demo, Win95/98] Get most features from your LX200 telescope keypad hand controller directly on your PC.
http://www.ccdsoft.com/lxctrldoc.html

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

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

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/

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).
http://www.willbell.com/almanacs/almanac_mica.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

GeoAstro Applet Collection
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

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/

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/

The Sun API
freeware - Windows] A library of functions for calculating key solar parameters for solar design including sundials.
http://www.sunlitdesign.com/products/thesunapi

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, and radius.
http://balder.prohosting.com/stouch/MOONCLOCK.html

AstroNotes
[commercial - Windows] A tool for recording observations and planning future observing sessions. Allows tracking of progress on common amateur observing programs (Messier, Herschel).
http://www.astronotes.com/

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.
http://www.alcyone.de/c88/english/index.htm

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

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

SBIG Linux Kernel/Library Module
This page contains Linux Kernel/Library Module for SBIG CCD Cameras
http://www.geocities.com/jan_soldan

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