Here is a project I have been working on iKatastr2 (SpatialReader) with myVR technology showing terrain model with overlays of OGC WMS services. All from freely available data. Presented at HxGN live 2013
at 39:10 watch myVR multiplatform rendering technology integrated in the mobile app for 3D map visualisation.
Here are also few pictures form HxGN live booth/keynote