CityGMLViewer
CityGMLViewer is, as the name implies, a CityGML viewer. It is based on OpenGL, and was developed by Matthias Betz at HfT Stuttgart.
It works on Windows and Linux.
It can display CityGML 2 and 3, and can show larger files than FZKViewer.
Here's the most recent version (v0.0.1).
There's a start.bat
script inside the zip file, which can be executed on Windows.
As an alternative, you can also download the code and compile it yourself:
git clone https://transfer.hft-stuttgart.de/gitlab/citygml/citygmlviewer.git
cd citygmlviewer
mvn package