This project contains VisualStudio .NET 2.0 Classes that implement the Google Earth API version 2.1. These classes do not use the Google Earth COM libraries, but rather generate KML based on the documented API at http://earth.google.com/kml
CUAHSI OpenHIS: Open Hydrological Information System is sponsored by National Science Foundation to develop infrastructure and services for the advancement of hydrologic science and education developed by Joe Hu,MapWindow software lab,Idaho State Univers
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 VisualStudio 2008, enhance it to fit your needs.