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
[commercial - Win95/98/NT/2000] Advanced auroral activity monitoring software.
http://solar.spacew.com/aurora/
[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
[commercial, demo available - Win95/98/NT] A comprehensive tool for displaying a variety of information on the Moon and aspects of its behaviour.
http://www.nightskyobserver.com/LunarPhase/index.htm
[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
[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/
[commercial, demo available - Win95/98/NT] Astronomical Observation Suite - Astronomical observation and logging software.
http://www.rainman-soft.com/
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/