Fitswork is described as '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' and is an app in the education & reference category. There are five alternatives to Fitswork for Windows, Linux, Mac, Flathub and Flatpak. The best Fitswork alternative is Siril, which is both free and Open Source. Other great apps like Fitswork 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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