Top 20 NuGet xamarin.forms Packages

CrossPlatformLibrary.Device is a plug-in for reading platform-independent device information.
CrossPlatformLibrary.Maps is a plug-in for map related concerns. It enables cross-platform map functionality.
CrossPlatformLibrary.Market is a plug-in for accessing platform-independent app market functionality.
CrossPlatformLibrary.Messaging is a plug-in for platform-independent communication (email, telephone, sms).
CrossPlatformLibrary.MetroLogTracer is a plug-in for CrossPlatformLibrary which adds MetroLog tracing support. MetroLog is a cross-platform logging/tracing framework similar to log4net.
Add Google AdMob ads to your Xamarin.Forms project. Supported projects: Xamarin.Android and Windows Phone 8 (Silverlight). Watch this video to lern how to install it: https://www.youtube.com/watch?v=RE4IbyLJtX0
Compass Plugin for Xamarin and Windows
CrossPlatformLibrary.WebBrowser is a cross-platform abstraction which allows to open browser requests.
A simple framework Mvvm framework for Xamarin Forms
A wrapper around WebView that will allow your application to display Markdown documents with bindable content and custom stylesheets.