I published an extensive article at CodeProject teaching how-to use Sciter technology in C# to create cross-platform desktop apps: http://www.codeproject.com/Articles/1057199/Sciter-HTML-Csharp-based-desktop-apps-walkthrough
But it is for Windows and Linux only.
At first, it has nothing to do with Xamarin, although it is an alternative to WPF which Xamarin is not porting AFAIK.
I am trying to port this C# library to OSX, which would require Xamarin MonoMac.
So I just want to know if someone is interested in such a tool for OSX/Xamarin?