Not necessarily cool perhaps but a critical piece of OSM infrastructure is osm2pgsql[1]. Also important tools in OSM land are osmium[2] and imposm[3] but the l

Not necessarily cool perhaps but a critical piece of OSM infrastructure is osm2pgsql[1]. Also important tools in OSM land are osmium[2] and imposm[3] but the latter I think is Go not C++. [1] https://osm2pgsql.org/ https://osm2pgsql.org/ [2] https://osmcode.org/osmium-tool/ https://osmcode.org/osmium-tool/ [3] https://imposm.org/ https://imposm.org/