See the OpenStreetMap ecosystem. Admittedly it's not quite the same vein as most Open Data, as the majority of Open Data implies it coming from closed sources.

See the OpenStreetMap ecosystem. Admittedly it's not quite the same vein as most Open Data, as the majority of Open Data implies it coming from closed sources. I'd also include other geospatial companies who provide visualisation and analyses tools which are using other things apart from OSM.