APT (Astro Photography Tool) - APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions.
Siril - Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning...
RegiStax - Photography, Astronomy, Image, and Astrophotography
DeepSkyStacker - DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of...
PixInsight - A powerful deep sky stacking application for astrophotography.
N.I.N.A. - NINA is a night time imaging and astronomy software.