Top 20 NuGet xamarin Packages

SDWebImage+FLAnimatedImage supported from iOS 8
Ecommunity.Mobile.PMR library
Xamarin bindings for Paho (HyperTrack dependency)
Xamarin bindings for Mqttv3 (HyperTrack dependency)
A Xamarin.Forms UI control package
AppFactory
Heimdall is an OAuth 2.0 client specifically designed for easy usage and high flexibility. It supports all grants as described in Section 4 as well as refreshing an access token as described in Section 6 of the The OAuth 2.0 Authorization Framework specification.
Tomei a liberdade de pegar o pacote Flunt criando pelo MVP Asp Net André Baltieri e transformar em uma portable library para ser usando no xamarin forms . A wiki contendo a explicação de usar o pacote está em https://github.com/andrebaltieri/flunt
Xamarin Service Component
Easily distinguish between iOS device screen types in Xamarin.iOS apps.
This package container server part for RhMemProfiler project. It runs on Android as a part of your application. It requires a client console which is available from memprof.rthand.com/client/DebugConsole.application
Plugin for Xamarin forms. Thread view
Package Description
This project is a cross platform library for Xamarin, which enables a handy use of InApp advertising in your applications.
This package contains Web related interfaces and services (e.g. REST client).
This package implements the Settings provider contracts via XamSettings
This package implements the core Settings provider contracts
This package implements the Serialization provider contracts via ServiceStack
This package implements the Serialization provider contracts via ProtoBuf