Links to my GUI system? If so, it's early days, and there is nothing public. I am using F#, my own bindings to GLFW, and SkiaSharp, which is an existing .NET binding and library over Skia, to prototype things. At this point, I have a basic windowing system down, and now I'm trying to figure out the right interface to the events that can be sent out to whatever wants them and also basic "widget" elements. But I am considering multiple windows from the start, and I have that working do a decently satisfactory level right now. Things will definitely keep evolving as I learn things though.
To be honest, I never wanted to create this. I originally wanted to experiment with making my own desktop programs but found the existing solutions too unsatisfactory or complicated. I also do not want to use C++. The closest I got was using Racket's GUI toolkit, but I found I was going to have to be writing a lot of custom widgets anyway, and I was also dealing with bugs and slogging through terse documentation.
To be honest, I never wanted to create this. I originally wanted to experiment with making my own desktop programs but found the existing solutions too unsatisfactory or complicated. I also do not want to use C++. The closest I got was using Racket's GUI toolkit, but I found I was going to have to be writing a lot of custom widgets anyway, and I was also dealing with bugs and slogging through terse documentation.