I know about gogrepo.py, but didn't have time to check the source and I am kind of reluctant to give my credentials to a 3rd party tool. But maybe I'll give it a try soon.
All the script does is log into gog.com and save the cookie locally. It doesn't store the credentials anywhere (they have to be passed as command line arguments). It then uses the cookie to query your library and download stuff.
It's very far behind when you look at the amount of censored / banned games. Germany is world class leader, at least in the so called "western world".
Yeah, but down under censors for more silly reasons.