DEM Net Elevation API

.Net library for Digital Elevation Models, allows 3D terrain generation in glTF / STL format.

CoordinateSharp

Easily parse or convert coordinate formats and calculate location based solar/lunar information.

GeoJSON.NET

.Net library for GeoJSON types & corresponding Json.Net (de)serializers

GeoJSON4EntityFramework

A library to create GeoJSON from Entity Framework Spatial Data or Well-Known Text (WKT) inputs.

OsmSharp

C# library to work with OpenStreetMap (OSM) data. Provides reading, writing and route-planning for OSM data.

SharpMap

An easy-to-use mapping library for use in web and desktop applications

NetTopologySuite

A .NET GIS solution that is fast and reliable for the .NET platform