I used to like GOG until they tried to force you to launch games through their own launcher instead of them being their own standalone applications.
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That being said, their launcher, GOG Galaxy[0] is amazing, and allows you to get a full overview of your games library across several services like GOG, Steam, Epic, etc. all in one place.
I use lgogdownloader on linux: https://github.com/Sude-/lgogdownloader
I made a post about it on Neogaf at the time. Mostly to my surprise, it looks like the post is still there complete with my screenshots: https://www.neogaf.com/threads/gog-is-now-using-adware-esque...
However, this was in 2017. Today, it is very easy to download your GOG purchases without ever touching Galaxy, and I am very appreciative.