FITS Liberator
The ESA/ESO/NASA FITS (Flexible Image Transport System) Liberator is a free software program for processing and editing astronomical science data in the FITS format to reproduce images of the universe. Version 3 and later are standalone programs; earlier versions were plugins for Adobe Photoshop. FITS Liberator is free software released under the BSD-3 license. The engine behind the FITS Liberator is NASA's CFITSIO library.

FITS has been a standard since 1982 and is recognized by the International Astronomical Union (IAU). While not limited solely to image data, archives in the FITS file format include images of stars, nebulae and galaxies produced by space-based and ground-based telescopes from around the world.

Although the first version of the software was an excellent tool used mainly by professional astronomers, efforts have been made to bring high quality astronomical images to the homes of amateur astronomers, educators and students. The FITS Liberator has become the industry standard for professional imaging scientists at the European Space Agency (ESA), the European Southern Observatory (ESO), and NASA. It uses images from the Hubble Space Telescope (HST) and the Very Large Telescope (VLT), among others, to craft beautiful colour astronomical images.

The first and second versions of the FITS Liberator were released in July 2004 and August 2005 respectively, the version, v3.0.1, was released in February 2012. The latest version 4.0.0 is available for download at the NOIRLab main repository . Starting with v3.0.1, FITS Liberator is a stand-alone product and Adobe Photoshop is no longer required for its use; the latest version is available for the three major operating systems.
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