Never heard of PanGUI - glad to see its C#, will have to try it out.

They're making the initial version with C#, but they have plans to make the library language-agnostic. Rather than creating bindings, they'll write it in a subset of C# and then transpile it to C++/Jai/Zig/etc, so you can get the best language integration without the hassle of also wrangling with your build system.