Software tools
The VCity implementation effort takes the form of the UD-SV (Urban Data Services and Visualization) software project that focuses on a set of software components dedicated to the experimentation, exchange, and sharing of both knowledge and tools for the concrete handling of urban/city data (that are based on the CityGML data model).
This open effort (VCity software is distributed with a GNU Lesser General Public License ) hinges on software building blocks briefly described here.
More on VCity tools: repository list tools