The Dashboard widget MultiDataMap allows to load different kinds of Ortomaps. Some examples in the following. As you can see, on the Ortomaps you can load any Snap4City layer: traffic flow, heatmaps, what-if analysis, routing, POI, sensors, etc. etc.
The ortomaps can be loaded: (i) from GIS servers as GeoServer, ESRI ArcGIS, QGIS, etc.... all in standard WMS, (ii) using other standard based on tiled via HTTP also accessible. Some of those solution may request a key. The key has to be provided by you at the moment of the request.
Another example is the Antwerp Overivew Dashboard: https://www.snap4city.org/dashboardSmartCity/view/index.php?iddasboard=MTQwNw==