Please Note: Exrin is no longer actively developed.
Exrin is an MVVM framework that sits on top of Xamarin Forms and provides structure and helper code for your application, all while enforcing certain architecture patterns. I also say it is an application library because it contains a little bit more than just MVVM.
Exrin is very opinionated, and it strongly encourages a certain architecture of your mobile application, hence Exrin will not be suitable for every project. Exrin also requires more setup than traditional MVVM frameworks, hence the overhead will certainly be too much, for small apps, or MVP’s for startup’s.
Below is a video, that details the architectural concepts of Exrin, and how to create your first app.