We have just released a new package called UrhoSharp, it provides a 3D and 2D game and visualization engine. Think of it as a cross-platform SceneKit, with many of the SceneKit features that you have come to love on iOS, but you figured "I could never use this, it would never work anywhere else".
We have posted documentation, samples and API docs.
Check it here:
And here is a cute animated gif of one of the games, it consists of about 1,300 lines of C# code. Which I bet would be 300 lines of F#: