The Image Reduction and Analysis Facility - A standard astronomical package for data reduction.
The Image Reduction and Analysis Facility (IRAF) is a general purpose software system for the reduction and analysis of astronomical data. IRAF is written and supported by a group of the National Optical Astronomy Observatories (NOAO) in Tucson, Arizona.
IRAF stands for the Image Reduction and Analysis Facility. It is a huge collection of software written by astronomers and by programmers at the National Optical Astronomy Observatory (NOAO). It is geared towards the reduction of astronomical images in pixel array form, that is, data taken from imaging array detectors.