Cartopolis is an attempt to recreate a FOSS Secondlife/OpenSimulator-like experience on top of OpenStreetmap data and 3DBAG(Nl-only pointcloud data of buildings). Should be useful for routing, sharing interactive building projects, socializing and geo-visualisations. The Android client was made with gps-rtk support in mind, so users can have fun with AR and cm-precise geocaching (TBD). Any thoughts? The project is at: https://code.garage44.eu/jeroen/cartopolis