Top 20 NuGet mapping Packages

Package Description
Providing a generation mapping file interface
Allows you to work with complex configuration structures in your app.config or web.config files. Doing it the classic way with System.Configuration is difficult and error prone. JJ.Framework.Configuration makes it super easy.
.NET's fastest JSON, JSV and CSV Text Serializers. Fast, Light, Resilient. Contains ServiceStack's high-performance text-processing powers, for more info see: https://github.com/ServiceStack/ServiceStack.Text
Interfaces for Mapping
OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles, vector data and markers loaded from any source. OpenLayers has been developed to further the use of geographic information of all kinds. It is completely free, Open Source JavaScript, released under the 2-clause...
Leaflet is designed with simplicity, performance and usability in mind. It works efficiently across all major desktop and mobile platforms, can be extended with lots of plugins, has a beautiful, easy to use and well-documented API and a simple, readable source code that is a joy to contribute to.
Interfaces for Mapping
Off-Sync.com Mapping Practises - Abstractions for building applications that use mappers.
Off-Sync.com Mappert - Fast and flexible object mapping for C#.
.NET's fastest JSON, JSV and CSV Text Serializers. Fast, Light, Resilient. Contains ServiceStack's high-performance text-processing powers, for more info see: https://github.com/ServiceStack/ServiceStack.Text
Supports Mapping operations.
Package Description
Reflection mapper wrapper for AutoMapper