I tend to use maps from a search browser and it suddenly occurred to me that if the search engine I used defaulted to open street maps I would use it. Do any search engines default map searches to open street maps?
@HubertManneQwant.com uses "qwant maps", which is basically OpenStreetMap in a different branding.
DuckDuckGo has Apple Maps as provider, which is partially based on OSM (but, meh). However, the bang !osm will take you to OpenStreetMap (and !wosm brings you to the OSM-wiki)