[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.

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.

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

[freeware - Linux] Command-line program to automate reduction of variable star CCD images.

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

[commercial & freeware - multiplatform] Interactive Java applets display the position, daily and annual path of the sun and the moon, for any time and location.

[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).

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

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

[opensource - POSIX] There is a sky. There are things in the sky. This program draws maps of things in the sky.