I know that some mods had issues with Skyrim from GOG as it uses a separate, different from Steams version, config directory. Some mods didn’t account for that and didn’t work. I’m assuming a similar issue with Fallout 4? Oddly enough older Fallouts and TES games use normal dirs so I don’t know why did they decide it’s a good idea.
Two that I know of that made decent games is K-D Lab that made Perimeter and Vangers (both open sourced and recently remastered), and Nikita responsible for the Parkan series. They’re not by any means greatest hits but they’re unique and worth checking out.
EDIT: And oh, Pathologic by Ice-Pick Lodge too, but I haven’t played those. Those seem funky and definitely not for everyone.
EDIT2: There’s apparently a list of Russian made games on Wikipedia , good to know.