Top 20 NuGet Xamarin Packages

Cross Platform Mobile Development

Generate a better rating for your Android app. It is easy to present your users with a dialog begging for a 5-star rating, but it takes a bit more attention to do it right. This small library takes away the boiler plate and makes it easy to ask for a rating the friendly way.
Like Button is a library that allows you to create a button with animation effects similar to Twitter's heart when you like something.
BadgedView is what Plaid and HuPu Sports uses to show a badge in an ImageView. BadgedView allows you show a badge into any Android's View.
Provides 9-patch based drop shadow for view elements. Works on Android API level 9 or later
Liferay Screens for Xamarin solutions
Admob Adapter is an Android library that makes it easy to integrate Admob native ads (both Express and Advanced) into ListView/RecyclerView in the way that is shown in the following image/animation.
SquareRatingView Allows you to have a rating view with few important customisations.
Speed up your work with new Runtime Permissions introduced in Android 6.0 Marshmallow. This lib allows you to monitor permissions, check them in background and as well ask for a permission in easy way (callback).
A swipe button for Android with a circular progress bar for async operations
PagerTabIndicator is a customisable android library that is designed to work with the ViewPager component.
Salesforce for Xamarin SDK is a cross-platform API for Salesforce supporting Xamarin.Android, Xamarin.iOS, Windows Phone Silverlight 8 and 8.1, Windows Phone 8.1 (WinRT), Windows 8.1 (WinRT) and Universal Windows Platform.
A flexible bridge to the Universal Windows Platform. Simplify your cross-platform development.
Forms Community Toolkit Converters for Xamarin.Forms Built against:
CrossPlatformLibrary.Connectivity is a plug-in for platform-independent access to network connectivity.
Easily have file system access from shared code using a common interface. Used by other plugins like JsonCache.
Support for running v2 tests on the UI thread
An android library to display a material-designed dialog with header.
Android library to realize the various states and transitions in a ProgressBar.
MeterView is a simple android meter component. It can handle exceeding values also by redrawing the whole scale.
Customized and RoundedEditText.