IRAF is the Image Reduction and Analysis Facility, a general purpose software system for the reduction and analysis of scientific data. IRAF includes a selection of programs for general image processing and graphics applications, plus a large number of programs for the reduction and analysis of optical astronomy data within the NOAO package. External or layered packages are also available for the analysis of HST, XRAY, and EUV data. IRAF provides a programming environment which includes the Command Language script facility, the IMFORT Fortran programming interface, and the SPP/VOS programming environment in which the portable IRAF system is written.
ESO-MIDAS (European Southern Observatory Munich Image Data Analysis System) provides general tools for image processing and data reduction with an emphasis on astronomical applications, including imaging and special reduction packages for ESO instrumentation at La Silla and the VLT at Paranal. It also contains an applications packages for stellar and surface photometry, image sharpening and decomposition, statistics, and more.
The Virtual Observatory Quantity Data Model (VOQDM) package is a "thing"-based data model for use with scientific and mathematical data in the International Virtual Observatory (IVO). It is built upon the QML (Quantity Model Language) package and, in general terms, enables fast, convenient serialization/deserialization/manipulation of Quantity-based objects and documents. An important specific application for this package is to enable the I/O of VO-catalog-based data.
SAOimage is a utility for displaying astronomical images under X11. Image files can be read directly, passed through a named pipe under Unix, or from a VMS mailbox from IRAF display tasks. It provides options for zooming, panning, scaling, coloring, pixel readback, display blinking, and region specification.
PyNOVAS allows you to calculate the position and movement of the sun, moon, planets, and stars with great precision using Python. It is based on the NOVAS software used by United States Naval Office (USNO) to produce the 'Astronomical Almanac' and 'MICA'. Ephemerides are supplied by the Jet Propulsion Laboratory (JPL). You can use this software for Celestial Navigation, and also as a basis for controlling astronomical equipment.
KAstrometry is an astrometry program for KDE. It is written in Python. It aims to be a good tool to make measurements of objects in space from images taken by CCD cameras. Such measurements might be used to find orbits of astroids or record the brightness of variable stars. One day, it should be able to record an object's position, detect stars, and find coordinates using star catalogs.