PixInsight - A powerful deep sky stacking application for astrophotography.
Removal.ai - Create transparent background for any image using Removal.ai - The fastest, easy-to-use & free tool to automatically remove backgrounds online.
DeepSkyStacker - DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of...
remove.bg - Remove the background of any image 100% automatically
APT (Astro Photography Tool) - APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions.
ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!