wxWidgets is not as well supported as Qt, nor is it as mature. I heard that GTK got some updates on Mac because the MonoTouch guys needed them, but the UI is th

wxWidgets is not as well supported as Qt, nor is it as mature. I heard that GTK got some updates on Mac because the MonoTouch guys needed them, but the UI is the same as far as I know. I think you can pick something else if you want to, but the two mentioned alternatives are probably not it.