Space Telescope Science Data Analysis System
Appearance
The Space Telescope Science Data Analysis System (STSDAS) is an IRAF-based suite of astronomical software intended primarily for processing data from the Hubble Space Telescope. STSDAS is produced by Space Telescope Science Institute (STScI).
License
The source code is available under a rather vague license reproduced here verbatim:
This software was prepared by Space Telescope Science Institute under U.S. Government contract NAS5-26555. Users shall not, without prior written permission of the U.S. Government, establish a claim to statutory copyright. The Government and others acting on its behalf, shall have a royalty-free, non-exclusive, irrevocable, worldwide license for Government purposes to publish, distribute, translate, copy, exhibit, and perform such material.
(from copyright.stsdas file)