Software
Here is a list of sofware that we believe are useful to practioners and researchers dealing with CityJSON.
Free and open-source software are marked by 
Table of contents
- Viewers
- Generators of 3D city models in CityJSON
- Editor and manipulators for CityJSON files
- Parsers and API for programmers
- Validators of different aspects of CityGML
Viewers
CityJSON QGIS plugin
A plugin that supports the loading of CityJSON datasets in QGIS3; these can be queried like any other layers in QGIS.
azul
A native and fast CityJSON viewer for macOS
Web-viewer
A simple web-viewer for CityJSON files
Generators of 3D city models in CityJSON
3dfier
Takes 2D GIS datasets and “3dfies” them by lifting each polygon to its height (obtained with LiDAR). Outputs CityJSON, CityGML, and OBJ
Editor and manipulators for CityJSON files
cjio
Python CLI to process and manipulate CityJSON files. Used as the ‘official’ validator for CityJSON files.
citygml-tools
CLI created with citygml4j, it allows us to convert CityJSON <-> CityGML in one-click.
CityJSON QGIS plugin
A plugin that supports the loading of CityJSON datasets in QGIS3; these can be queried like any other layers in QGIS.
Parsers and API for programmers
cjio
Python CLI to process and manipulate CityJSON files. Used as the ‘official’ validator for CityJSON files.
citygml4j
Open source Java class library and API
Validators of different aspects of CityGML
(look at the tutorial on validation where more details are available)
cjio
Python CLI to process and manipulate CityJSON files. Used as the ‘official’ validator for CityJSON files.
val3dity
Validation of 3D GML primitives according to the international standard ISO19107