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...
Source: [Hacker News](https://news.ycombinator.com/item?id=49411624)