Freeware

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

 Free tools for visualizing CityGML files

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 --> Download
Institute for Cartography and Geoinformation, University of Bonn	Aristoteles, an Open Source viewer for CityGML Data. --> Download
Snowflake Software	GML Viewer, a Generic 2D GML Viewer capable of viewing CityGML. --> Download