This is a port of LibRTK on C#, and into a small c/c++ library.
RTKLIB is an open source program package for standard and precise positioning with GNSS (global navigation satellite system). RTKLIB consists of a portable program library and several APs (application programs) utilizing the library. This port includes only a library (.so or .dll) for the C/C++ language and a .dll for C#/.NET Framework. RTKSharp is compatible with Windows and Linux using the .NET/Mono Assembly withoout the need of recompilation/cross-building.
This is a simple C# library for translating Latitude and Longitude, and taking the heading and tilt of a camera (such as attached to a UAV) and converting it to a point on the ground it's looking at.
GPSBabelWrapper allows the rest of us to use rich functionality of GPSBabel via familiar Windows interface. It only builds a command line and calls GPSBabel. GPSBabelWrapper is similar in goals to Gebabbel and to the standard GPSBabelGUI.exe
This project is attempting to create an maintain a public implementation of the Active Record pattern, to be used with ESRI products, coded using ArcObjects and C# 3.5.
.NET Tools and Libraries for the Advancement of the Sciences
QuakeMap GPS mapping program - see quakemap.com and download free trial there. This is a complete Open Source version (no different in features than the commercial version). You can compile it in Visual Studio 2008, enhance it to fit your needs.