Freeware

Beside commercial software packages there is also a number of free tools and services that support CityGML.

 Free tools for visualizing and editing CityGML files

Forschungszentrum Karlsruhe Institute for Applied Computer Science	FZKViewer, a viewer for IFC and CityGML Data. --> Download
Fraunhofer Institut Graphische Datenverarbeitung / Graphische Informationssysteme	CityValidator, a free online service for checking CityGML Data. --> more
Hasso-Plattner-Institut / 3D Geo GmbH	LandXplorer CityGML Viewer, a viewer for CityGML Data. --> Download
Hochschule für Technik, Stuttgart	QS-City 3D, a free online service for checking CityGML Data. For larger models the software can be downloaded. --> more
Institute for Cartography and Geoinformation, University of Bonn	Aristoteles, an Open Source viewer for CityGML Data. --> Download
Institute for Geodesy and Geoinformation Science, Berlin University of Technology	3D City Database, a free 3D geo database for the storage and management of virtual 3D city models based on CityGML - to be used in conjunction with Oracle 10G R2 Spatial (or 11G). 3D City Database Import/Export Tool, a free and open-source Java software tool facilitating the import and export of CityGML datasets into the 3D City Database. citygml4j, an open-source Java class library and API for the processing of 3D city models encoded in CityGML. --> more information and download
Liquid Technologies Ltd.	Liquid XML Editor, a free graphical XML Schema Editor (XSD), intellisense XML Editor and XSD & XML Validator. --> Download
Snowflake Software	GML Viewer, a generic 2D GML Viewer capable of viewing CityGML. --> Download