A few months ago I wrote about OAuth 2.0 for native apps, mentioning App Auth, an OAuth 2.0 client library for native Android and iOS applications. Recently I discovered that a similar library has been release for .NET! It is a PCL (Xamarin included) and it features the same security concerns as App Auth, following the IETF recommendations for native OAuth 2.0 clients. In addition, it also supports OpenId Connect features, such as validating identity tokens. Very nice!