Share - GpsGate lets you share one GPS between several applications. GpsGate can create any number of virtual serial ports which most NMEA enabled GPS applications can connect to.
GpsTools ActiveX / .NET is an easy and cost efficient way to develop GPS and mapping applications in Visual Studio. The rich set of samples and documentation makes it easy for developers that are new to this area to get a quick start. Support for both Pocket PC and Windows.
The Waymex GPS Library for .Net V3 is a .Net assembly that allows GPS functionality to be easily added to any .Net project. The product supports .Net 2.0 and 1.1 (a separate assembly for each version of the framework is supplied) and provides simple object based access to Garmin and Magellan GPS devices from within your Visual Studio 2003 or Visual Studio 2005 project.