This is not a category of software that I'm familiar with, so I don't know how Nebulosity compares to its competitors, free or proprietary. My intuition says t

This is not a category of software that I'm familiar with, so I don't know how Nebulosity compares to its competitors, free or proprietary. My intuition says that 71,000 lines of C and C++ code is manageable for a person or group with the right motivation. One thing that puts a clock on it in the intermediate to long term is camera support, which I gather from the README is a significant maintenance task. The project will bleed users if it doesn't support their new cameras. Edit: it looks like Nebulosity sold for $95. Some other software in this space I see mentioned on the Cloudy Nights forum are Astro Pixel Processor (€ 165), PixInsight (€ 165), and Siril (free).