Xamarin.iOS and Xamarin.Android samples (aka MonoTouch or Mono-for-Android)
Samples that use Xamarin.Forms (http://xamarin.com/forms)
Support libraries for xamarin-macios
A collection of .NET for Android sample projects
Samples for .NET Multi-Platform App UI (.NET MAUI)
samples for Xamarin.Forms Windows Preview
Planet Xamarin
Monospace 2009 Conference Schedule iPhone App
Xamarin.Mac-based Cocoa driver for Mono's System.Windows.Forms
LLVM toolchain for .NET for Android
Xamarin To Do list sample using various cloud back-ends
Apps using Xamarin.iOS with the 64-bit API and targeting iOS 8 and newner
.NET for iOS, Mac Catalyst, macOS, and tvOS provide open-source bindings of the Apple SDKs for us...
.NET MAUI My Coffee App
Feature samples for the Windows App SDK