We're using Unity (Quarter Circle Games). I'm happy to give an interview and some of my lighting/PP techniques. You can view out game here: https://store.steampowered.com/app/907500/The_Peterson_Case/
This is a fan project, like the Lord Inquisitor was. GW has absolutely nothing to do with it!
The city of Zurich published its 50000 detailed 3D buildings as open data.
— Christian Hürzeler (@ChrisGis3D) November 12, 2018
Basically, you can use these data sets to build your own scenes or just have some fun.
“The data catalog is your central entry point for searching and using open data of the city of Zurich.” The data published by the team is available free of charge, and you can also use it for commercial projects.
You have to admit that this is quite awesome. You can get more details here.