DeepSkyStacker is described as 'Freeware for astrophotographers that simplifies all the pre-processing steps of deep sky pictures' and is an app. There are more than 10 alternatives to DeepSkyStacker for a variety of platforms, including Windows, Linux, Mac, Web-based and Flathub apps. The best DeepSkyStacker alternative is Siril, which is both free and Open Source. Other great apps like DeepSkyStacker are FITS Liberator, Sequator, SAOImageDS9 and PixInsight.
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.
Siril is the number one software alternative to DeepSkyStacker
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.
Sequator is a free software which can track stars on multiple images, align stars and stack them.
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.
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.
Starry Landscape Stacker makes it possible to produce landscape photographs taken at night that have both low noise and stars rendered as points.
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.
The Astro App is a tool for exploring the night sky and tracking celestial events. It's primarily targeted for amateur astrophotographers.
Astroart is a software for image processing, image analysis, astrometry, photometry, camera and telescope control.
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lots of automated processes self explanatory AND runs on MAC!!!!