 <p><a href="http://xamarin.com/mac" rel="nofollow">Xamarin.Mac</a>: an open source library for building Cocoa applications on OSX using C# and .NET.</p> <p>You can dig into the <a href="https://github.com/xamarin/xamarin-macios" rel="nofollow">source code</a> and read the <a href="https://developer.xamarin.com/guides/mac/getting_started/hello,_mac/" rel="nofollow">documentation</a>.</p>