Osm2pgsql tool is quite famous in the OpenStreetMap community : it allows to transform raw OSM data into a ready-to-use PostgreSQL database. It is commonly used for setting up rendering or geocoding databases. People also use it to run various data analysis, which are made quite simple using extensions like PostGIS. However, for a quite long time, it was not so intuitive to fine tune osm2pgsql to go further.
