PixInsight - A powerful deep sky stacking application for astrophotography.
APT (Astro Photography Tool) - APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions.
Star Tools - Star Tools is one of the most advanced image processing tools that you can use for astrophotography.
Siril - Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning...
Skyimaging.com - Skyimaging.com is a popular website for dealing with astronomy and particularly with the Lunar and Planetary astrophotography and Deep Sky Imaging.
Wireless Allsky Camera Project - The wireless Allsky Camera Project is an initiative by Thomas Jacquin for running an all sky camera on Raspberry Pi.