Siril - Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning...
Sequator - A star stacking program that can deal with landscape foreground masking.
APT (Astro Photography Tool) - APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions.
DeepSkyStacker - DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of...
PixInsight - A powerful deep sky stacking application for astrophotography.
Astro Pixel Processor - Astro Pixel Processor is a deep sky image processing software.