Open Source Geospacial Software in C#

Microsoft-sponsored collection of tools for SQL Server spatial types: CLR functions and aggregates (ConvexHull, Densify, Interpolate, ShiftGeometry), LRS functions, geography/geometry validation and conversion. Can be registered in SQL Server or used from . NET.

C#/. NET port of JTS Topology Suite for GIS: OpenGIS-compliant 2D geometry, predicates, and operations. Fast, reliable across .

NET spatial reference and projection engine: point-to-point coordinate conversions between geodetic systems (WKT/XML). Supports datum transforms, geographic and projected CRS. .

Easy-to-use mapping library for web and desktop. Multiple data sources (shapefile, PostGIS, WMS, GeoPackage, SQL Server). Spatial querying and rendering; WPF and WinForms controls; integrates with NetTopologySuite.

Desktop planetarium and sky mapping program. Tracks planets, deep-sky objects, and stars with Tycho-2 and Hipparcos catalogs; supports comets, asteroids, eclipse simulation, and night-vision mode. Cross-platform with OpenGL.

NET classes for geographic information; port of JTS 1. x to C#. Implements OpenGIS Simple Features and Coordinate Transformation Services.