Top 20 NuGet android Packages

Xamarin.Android bindings for Android Support Library - support-fragment
Xamarin.Android bindings for Android Support Library - transition
Xamarin and Windows plugin to vibrate your devices. Read the full documenation on the projects page.
The local notification plugin provides a simple, cross-platform way to show local notifications from within Xamarin and UWP apps.
MvvmCross is the .NET MVVM framework for cross-platform solutions, including Xamarin iOS, Xamarin Android, Xamarin Forms, Windows and Mac. This package contains the 'PhoneCall' plugin for MvvmCross
MvvmCross is the .NET MVVM framework for cross-platform solutions, including Xamarin iOS, Xamarin Android, Xamarin Forms, Windows and Mac. This package contains the 'PictureChooser' plugin for MvvmCross
This 'batteries-included' bundle brings in SQLitePCLRaw.core and the necessary stuff for certain common use cases. Call SQLitePCL.Batteries.Init(). Policy of this bundle: iOS=system SQLite, others=e_sqlite3 included
Simple cross-platform plug-in that allows you to pick files and work with them. Version 2.0 now supports .NET Standard and Visual Studio 2017.
A cross-platform API for authenticating users and storing their accounts.
A simple caching library to cache any data structure for a specific amount of time in any .NET application. Additionally, offers simple HTTP methods for caching web request data.
Xamarin.Essentials: a kit of essential API's for your apps
Aspose.Email for .NET is a collection of components for working with email from within ASP.NET web applications, web services or Windows applications. It makes it easy to work with Outlook PST, EML, MSG and MHT files.
Xamarin.Android bindings for Android Support Library - mediarouter-v7
Xamarin.Android bindings for Android Support Library - support-v4
Xamarin.Android bindings for Android Support Library - palette-v7
Xamarin.Android bindings for Android Support Library - recyclerview-v7
Xamarin.Android bindings for Android Support Library - customtabs
Xamarin.Android bindings for Android Support Library - animated-vector-drawable
Xamarin.Android bindings for Android Support Library - support-vector-drawable
Xamarin.Android bindings for Android Support Library - support-compat