QTViewer is described as 'Libmini is free software that displays geographic terrain data at real-time. This is an example application of integrating libmini in the Qt user interface. The application, the libMini QTViewer, primarily uses libmini viewer functions but provides additional camera control' and is an app. There are six alternatives to QTViewer for a variety of platforms, including iPhone, Mac, Windows, Linux and iPad apps. The best QTViewer alternative is Google Earth. It's not free, so if you're looking for a free alternative, you could try Google Earth or Marble. Other great apps like QTViewer are Live Street View MAp Explorer , Earth3D app and Satellitemap.space.