Features the following programs: an ephemeris calculator, a collection of astronomical data in electronic form, Planet Orbits, C88, and Planetary, Lunar, and Stellar Visibility.

Promoting the use of open scriptable tools for amateur and educational astronomy.

A community Python library for astronomy.

A free project repository for [semi-]open astronomical software.

Provides a library of functions and routines written in the Interactive Data Language (IDL). Developed mainly for use in astronomy, the library also supplies general scientific and programming applications.

A software system for the reduction and analysis of astronomical data.

The INDI library provides a framework for control and automation of astronomical instruments.

[commercial, demo available -- Win95/98/NT] Includes calendars required by historians of astronomy and general historians. Many details are provided for Indian and Jewish calendars. There is also a display of positions of the Sun, Moon and planets,