Can you recommend a Linux program that allows me to visualize CityGML models (3D)?
I have tried a whole bunch so far (most of them via wine but also native ones) but I couldn't get a single one of them running.
I am using Ubuntu 13.04.
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3DCityDB supports CityGML: https://www.3dcitydb.org/3dcitydb/
At first you need to import a CityGML file to the database (I would suggest PostGIS) and then you have 3DCityDB-Web-Map-Client based on Cesium JS which allows to visualize all the features.
Just to add there is a data warehouse tool FME. It's a set of tools, very easy to use, also have extensive customer support since it's a commercial software. You can use it for free if you are a student.