OpenStreetMap (https://www.openstreetmap.org/export#map=6/51.324/10.426) is built by a community of mappers that contribute and maintain data about roads, trails, cafés, railway stations, and much more, all over the world. Planet.osm is the OpenStreetMap data in one file.
OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. organisations support OpenStreetMap: https://hardware.openstreetmap.org/thanks/
Planet.osm mirrors: https://wiki.openstreetmap.org/wiki/Planet.osm#Planet.osm_mirrors
OpenStreetMap datasets: https://archive.org/details/osmdata http://openstreetmapdata.com/data
There are also files called Extracts which contain OpenStreetMap Data for individual continents, countries, and metropolitan areas: BBBike https://download.bbbike.org/osm/, Geofabrik http://download.geofabrik.de/