YAOM - Yet Another Open Map

A curated collection of authoritative and non-authoritative datasets in a OpenStreetMap-compatible format and data model,
along with the scripts and documentation to produce and use this data.

Read the specification draft and discuss it on the forum.

As a proof of concept, I've built a prototype map of my city, Madrid. It is rendered with osm-carto, the default map style in osm.org. At higher zoom levels, it shows all public benches and trees in the city, among many other features missing in other maps. You can also download the data.