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   Processing Nebula Images with Open Source Tools vs$350 Software (astroimagery.com)
Instead of using the more expensive software such as Pixinsight which costs at least 300 Euros, I try to use free software where possible. I do use Photoshop a little which is not free but not expensive either.

I have used many techniques in Siril and Seti Astro Suite to create many awesome astro images. These two programs are constantly improving! Which software do you use for astrophotgraphy?