Top 20 NuGet Xamarin Packages

Cross Platform Mobile Development

This package includes Windows.System.Power like APIs cross-platform such as: - PowerManager for providing access to information about a device's battery and power supply status.
This package includes Windows.System.Display like APIs cross-platform such as: - DisplayRequest for providing a lock on the screen sleep period.
Invention Platform is a portable application development API.
Abstracts native components to provide a simple popup menu on each platform.
I18NPortable plugin to support json file formats
Part of Twitter Fabric, Answers is real-time mobile analytics that you don't need to analyze. It was created to make understanding your user base incredibly simple -- so you can spend your time building amazing experiences in your product, not digging through data.
Part of Twitter Fabric, Crashlytics offers the most powerful, yet lightest weight crash reporting solution for iOS. Crashlytics also provides real-time analytics through Answers and app distributions to testers using Beta.
Aprende a programar con Xamarin Workbooks, C# y la legendaria Tortuga!
A simple filename helper class for content files
UIStackView for use with MvvmCross
A Bottom Navigation Bar implementation for Xamarin Forms.
Xamarin binding for https://github.com/TUBB/SwipeMenu, used by http://talktosomeone.net
Binding library of https://github.com/wdullaer/MaterialDateTimePicker v2.5.0
PCLMock is mocking framework in a PCL, making it usable on platforms such as iOS and Android.
Rb.Forms.Barcode is a Xamarin.Forms view for scanning barcodes full of awesomeness and also unicorns. Please check the website for further details.
Xamarin.Forms side menu control (targeted at Android & iOS)
An easy to use extension for SQLite.Net PCL that allows you to seamlessly encrypt/decrypt data when inserted/accessed from the database by adding one simple attribute. Works great one all major platforms (iOS, Android, Windows Universal)
Xamarin.Forms gestures plugin for view controls (targeted at Android & iOS)
Porting of Blend behaviors core infrastructure to Xamarin Forms
Just some simple models to have an abstract MVVM model that will work with almost all MVVM frameworks