Regim is described as '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' and is an app. There are five alternatives to Regim for Windows, Linux, Mac, Flathub and Flatpak. The best Regim alternative is Siril, which is both free and Open Source. Other great apps like Regim are DeepSkyStacker, FITS Liberator, SAOImageDS9 and IRIS Astronomical Images.
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.
SAOImageDS9 is an astronomical imaging and data visualization application. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps.
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