Make 3D virtual buildings, with Skyscraper Simulator
Skyscraper is a free and open-source 3D building simulator. If you’re interested in high-rise architecture and elevators, then you may find useful this application.
Skyscraper allows you to create your own buildings and experience them in full first-person 3D.
Features: Skyscraper aims to be a fully-featured, modular, 3D real-time building simulator, powered by the Scalable Building Simulator (SBS) engine.
The main feature SBS provides is a very robust elevator simulator, but also simulates general building features such as walls, floors, stairs, shaftwork and more.