Xamarin.iOS helps creating iPhone and iPad applications. You may use your favorite .NET libraries in Xamarin.iOS applications. You can reuse up to 90% of your existing C# code when porting from iOS to Android. In addition, you can easily bind third-party native libraries and frameworks.
v1.1 [May 4, 2013]
Alpha/Preview: Introduces support for async programming and major compiler and GC optimizations.