SAOImageDS9 is described as 'Astronomical imaging and data visualization application. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps' and is an app. There are nine alternatives to SAOImageDS9 for a variety of platforms, including Windows, Linux, Mac, Web-based and Flathub apps. The best SAOImageDS9 alternative is Siril, which is both free and Open Source. Other great apps like SAOImageDS9 are DeepSkyStacker, FITS Liberator, AvisFV and Regim.
Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning them automatically or manually, stack them and enhance final images.
DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of deep sky pictures.
FITS Liberator GUI image processing software has meant that it is even easier and faster to create color images using raw observations from a range of telescopes.
AvisFV is a free FITS viewer for Windows 11, 10, 8, 7 (compatible also with most Linux and Mac if WINE is installed).
Regim makes some processing steps that are unique to astronomical images a bit easier. These steps are calibration (dark and flat), deblooming, registration, combination, color calibration, gradient removal and some more.
PixInsight is an advanced image processing platform specialized in astrophotography and other technical imaging fields, constantly pushing the boundaries of astronomical image processing with the most powerful toolset available.
The Astro App is a tool for exploring the night sky and tracking celestial events. It's primarily targeted for amateur astrophotographers.
Fitswork is a windows image processing program, mainly designed for astronomic purposes. It contains batch processing, histogram functions, many filters, etc. Fitswork works entirely in floating-point arithmetic.
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