This is a Level Creator for the Skyline Game Development System (http://www.chi-ad.com/Skyline/SDN/). It is written in C++ using Qt 5.3.
Most of the setup files are xml based and there will be examples showing how to use models from both http://arteria3d.myshopify.com/ and http://www.3dmodels-textures.com/
Obviously, to view the completed Level in the Skyline Engine, you will need Skyline and the relevant models.
The models used have been from the Sci-Fi Pack from Arteria3D...