Simurban is described as '® is a 3D simulation software suite that allows users to create, view and interact with accurate and photorealistic models of any built environment. Ideal for development assessment, strategic planning and design'. There are more than 10 alternatives to Simurban for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is Blender, which is both free and Open Source. Other great apps like Simurban are Sketchfab (Freemium), OGRE (Free, Open Source), Pygame (Free, Open Source) and Grit Game Engine (Free, Open Source).
Sketchfab is the first web service to publish interactive 3D content online in real-time without plugins. Every new format has its global platform: videos have Youtube, photos have flickr, sounds have Soundcloud... Now 3D files have Sketchfab.
OGRE (Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce applications utilizing hardware-accelerated 3D graphics.
Pygame is a set of Python modules designed for writing video games. Pygame adds functionality on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language.