ogr2gui is a open source project offering a graphical user interface (gui) for ogr2ogr. ogr2ogr is a command line utility used to convert and manipulate geospatialdata.
G2C (Geospatial to Civil)
The LandGML Interoperability Experiment initiated by Autodesk, U.S. Army Corps of Engineers Engineering Research and Development Center, and Galdos Systems. this open source tool transforms LandGML into LandXML documents.