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.
Kea is a web-based application build with C#. It's purpose is to help in the management of small-medium Vineyard & Winery in their everyday tasks: will help with law requests for winemaking. Will also be accessible by Pocket PC and will be GIS enabled