This repository contains samples for Xamarin.Forms that were written by Charles Petzold but which are not in https://github.com/xamarin/xamarin-forms-samples, or in Creating Mobile Apps with Xamarin.Forms usually because they demonstrate unorthodox techniques, or because they don't work very well, or because they push the outside of the envelope to the point where it breaks.
As of November 19, 2015, all samples have been updated to Xamarin.Forms 1.5.0.6482, and UWP projects have been added.