Unity 3D is a very modular and powerful game engine. With Home Viewer, you can now enjoy easily visiting virtual places made with Unity on a web page. This can be used for architecture, but also for showing any 3D project to the world.
There are a few plugins for Unity to capture 360 images inside the engine. We used this very simple plugin to create our images.
We used the awesome architecture environment made by Ruggero Corridori, available here on the Unity Asset Store. A big thanks to him.