Top 20 NuGet monodroid Packages

Localization plugin for Xamarin and Windows
OkHttp ability to be used with HttpURLConnection.
An HTTP+HTTP/2 client for Android and Java applications.
A cross-platform API for authenticating users and storing their accounts.
Lightweight ActiveRecord-inspired ORM for .NET, Windows Phone and Mono(Touch/Droid)
PCL Testing is a simple test framework for writing portable tests and running them on .NET, Windows Phone, Windows Store, Xamarin.iOS, Xamarin.Android, and Silverlight.
Easy-to-use calculated properties for MVVM apps (.NET 4, MonoTouch, MonoDroid, Windows 8, Windows Phone 8.1, Windows Phone Silverlight 8.0, and Silverlight 5).
Rivets is a C# implementation of App Links. It's functionally a port of Bolts, the Java/Obj-C implementation. App Links are a new open source, cross-platform standard for helping link between Mobile and the Web (and vice-versa). App Links are a defined set of metadata that can be advertised within...
Portable .NET API for Fog Creek's FogBugz bug tracking system
[DEPRECTATED] Use Xamarin.Google.Android.Vending.Expansion.Downloader instead. C# implementation of Google's Android APK Expansion Downloader.
A RFC6455-compliant web socket implementation.
The Engine.IO Client Library for Android
The Microsoft Band SDK gives developers access to the sensors available on the band, as well as the ability to create and send notifications to tiles. Enhance and extend the experience of your applications to your customers' wrists.
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).