Top 20 NuGet location Packages

A library to make things cross-platform that should be
Google Places, Maps, Roads, Search and Translate. Requests and Responses are complete with Google api documentation and references.
The library provides an abstraction over IoC containers and service locators. Using the library allows an application to indirectly access the capabilities without relying on hard references.
Unity Service Location
The Boerman.FlightAnalysis package contains algorithms to analyze flight movements and extract information like departure time and airfield, arrival time and airfield, total air time and more.
Common Models for Location.
Coordinate utilities.
Operations and data types used with the ArcGIS REST API.
ArcGIS Runtime controls and utilities for Universal Windows Platform (UWP), Windows Presentation Foundation (WPF), Xamarin.Android, and Xamarin.iOS apps.
ArcGIS Runtime SDK for .NET enables you to add powerful mapping and spatial capabilities to your Windows Presentation Foundation (WPF) apps. Use a wide range of mapping and GIS tasks online and offline, including data visualization, editing, geocoding, and routing.
ArcGIS Runtime SDK for .NET enables you to add powerful mapping and spatial capabilities to your Xamarin.Forms Android, iOS, and UWP apps. Use a wide range of mapping and GIS tasks online and offline, including data visualization, editing, geocoding, and routing.
ArcGIS Runtime Hydrography extends ArcGIS Runtime SDK for .NET with support for Electronic Navigational Charts (ENCs) for your Windows Presentation Foundation (WPF), Universal Windows Platform (UWP), Xamarin.Android, Xamarin.iOS, and Xamarin.Forms (Android, iOS, and UWP) apps.
Microsoft Azure Management Maps Library
Simple platform independent location manager for iOS and Android (Xamarin)
ArcGIS Runtime SDK for .NET enables you to add powerful mapping and spatial capabilities to your Universal Windows Platform (UWP) apps. Use a wide range of mapping and GIS tasks online and offline, including data visualization, editing, geocoding, and routing.
GpsNose is a geo-based social platform. You can use this SDK to attach the user management and real-world connectivity of GpsNose to your project or website. Your users can use their mobiles to login by the QR-code at your app/web and can describe, explore and communicate in their real current geogr...
ArcGIS Runtime SDK for .NET enables you to add powerful mapping and spatial capabilities to your Windows Presentation Foundation (WPF) apps. Use a wide range of mapping and GIS tasks online and offline, including data visualization, editing, geocoding, and routing.
ArcGIS Runtime Local Server SDK extends ArcGIS Runtime SDK for .NET with advanced spatial data management and analysis for your WPF apps. Requires additional download and installation of the ArcGIS Runtime Local Server SDK: http://links.esri.com/arcgis-runtime-local-server-sdk
Monitors geofence regions and handle region state changes events. Across iOS and Android from a single API.
ArcGIS Runtime SDK for .NET enables you to add powerful mapping and spatial capabilities to your Xamarin.Android apps. Use a wide range of mapping and GIS tasks online and offline, including data visualization, editing, geocoding, and routing.