ootb-openstreetmap

A map block for WordPress' Gutenberg Editor which uses OpenStreetMap and Leaflet.js. It needs no API keys and works out of the box. Benefiting from Gutenberg’s potential, the plugin tries a different take on how to add your locations on the map and rethinks a few things, UX-wise. Install it from https://wordpress.org/plugins/ootb-openstreetmap/. Maintained by gsarig on GitHub, where it has earned 34 stars from the community.

It's actively developed around gutenberg, leafletjs, markers, and is a solid reference for anyone building with these tools.