Top 20 NuGet android Packages

Create TabStrip style tabbed navigation control. Configure control to have custom navigation headers and custom navigation arrows.
Xamarin bindings for Google Volley
Small library that provides... bouncing dots. This feature is used in number of messaging apps (such as Hangouts or Messenger), and lately in Android TV (for example when connecting to Wifi). Don't forget to add Mono.Android.Export as reference.
Android Code Highlighter. Don't forget to add "Mono.Android.Export" as reference to your solution.
AppRater Plugin for Xamarin.
A Framework for creating code that performs Platform Dependent Tasks in a Generic, OS Independent manner.
PCLMock is mocking framework in a PCL, making it usable on platforms such as iOS and Android.
GoogleMapsUtils library for Xamarin Android.
Proof-of-concept NControl for rendering an SVG with optional 9-slice insets.
HolisticWare.System.Data.DataSetExtensions System.Data.DataSetExtensions package for Xamarin.Android and Xamarin.IOS needed by some libraries like Sigil (JIL JSON serialization)
Spotify SDK Xamarin bindings (Xamarin.Android and Xamarin.iOS)
SoundCloud SDK Xamarin bindings (Xamarin.Android and Xamarin.iOS)
Samsung SDK Xamarin bindings RichNotifications (Xamarin.Android)
Samsung SDK Xamarin bindings ProfessionalAudio (Xamarin.Android)
Samsung SDK Xamarin bindings Pen.Light (Xamarin.Android)
Samsung SDK Xamarin bindings Pen (Xamarin.Android)
Samsung SDK Xamarin bindings Pass (Xamarin.Android)
Samsung SDK Xamarin bindings MultiWindow (Xamarin.Android)