A multi-purpose tool for working with geospatial data.
FDO Toolbox is an multi-purpose geospatial tool to create, analyse, convert, process and manage spatial data. It is written in C# and uses the Feature Data Objects (FDO) API (http://fdo.osgeo.org)
Depending on the version of FDO Toolbox you have, you will need the following components installed as well:
FDO Toolbox was previously hosted on Google Code
Disclaimer: Know what you are doing before trying this on production-quality geospatial data.