The client, like that connects to the server, I guess. It recovers the information for the server and displays it.

What does "Minecraft client" mean? the engine?

Think was working on this for quite a while, also made the cool Minecraft client called [Steven](https://github.com/Thinkofname/steven). Pretty neat to see UniverCity become open source :)

Looks like a custom rendering engine powered on top of opengl https://github.com/Thinkofname/UniverCity/tree/master/src/render

Nice! What is the general approach to graphics here? Does SDL2 help a lot or has the author made basically their own graphics engine, or using an existing one?

UniverCity open source release (university management sim in Rust)