Top 20 NuGet mobile Packages

NoSql for Xamarin and .net. Persists plain C# objects, including child objects, lists and collections. Supported on Xamarin (Android and iOS) and Windows (8.1-10 and Phone 8.1-10).
A library generated from a Swagger doc
A General purpose rest ApiClient write in C# language for the OneSignal API.
You probably want Spooky.Json20, not this package. Spooky is a client RPC library for .Net, providing an abstraction layer for RPC calls (using sytems such as Json RPC).
Canopy testing framework for mobile apps
SQLite-net is an open source and light weight library providing easy SQLite database storage for .NET, Mono, and Xamarin applications. This version uses SQLitePCLRaw to provide platform independent versions of SQLite.
SignalR binding library for Bridge.NET projects.
Scripthost binding library for Bridge.NET projects.
jQuery binding library for Bridge.NET projects.
Express Brute Memcached (express-brute-memcached) binding library for Bridge.NET projects.
Exceljs binding library for Bridge.NET projects.
ES6 Error (es6-error) binding library for Bridge.NET projects.
ES5 binding library for Bridge.NET projects.
Electron Devtools Installer (electron-devtools-installer) binding library for Bridge.NET projects.
Dustjs Linkedin (dustjs-linkedin) binding library for Bridge.NET projects.
Dropzone binding library for Bridge.NET projects.
Dragula binding library for Bridge.NET projects.
Dotenv binding library for Bridge.NET projects.
DOM binding library for Bridge.NET projects.
D3 Timer (d3-timer) binding library for Bridge.NET projects.