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I'm looking for an open source GIS that supports viewing and editing of CityGML models.

So far, I've found a list of open source applications that support CityGML, but they all seem to be stand-alone applications, that don't integrate with common GIS systems: http://www.citygmlwiki.org/index.php/Open_Source.

I would also be interested in your experience with CityGML in a GIS (also commercial) context.

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deegree3D (part of a broader FOSS geospatial project, deegree) looks like it might work for you. Probably depends a lot on what features you need. Unfortunately I haven't tried it, so I can't comment on its use or reliability.

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3D City DB offers multiple open tools, including a database:

The 3D City Database has been realized as Oracle Spatial/Locator and PostgreSQL/PostGIS database schema, supporting following key features:

and web viewer

The 3DCityDB-Web-Map-Client is a web-based front-end of the 3DCityDB for high-performance 3D visualization and interactive exploration of arbitrarily large semantic 3D city models in CityGML. It utilizes the Cesium Virtual Globe as its 3D geo-visualization engine based on HTML5 and Web Graphics Library (WebGL) to provide hardware acceleration and cross-platform functionalities like displaying 3D graphic contents on web browsers without the needs of additional plugins.

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azul may also be of your interest: it is a CityGML viewer developed for macOS.

It is free (on the App Store and Github), and it is open-source. It does not have editing functions though.

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You might also want to check and follow the list of CityGML software on the new citygml.org page.

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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.

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