by Giorgos Sarigiannidis on WordPress.org
A map block for Gutenberg using OpenStreetMap and Leaflet that needs no API keys and works out of the box. Or should we say, ...Out of the Block?

Adding markers and rich content
A map block for Gutenberg which uses OpenStreetMap and Leaflet.js. It needs no API keys and works out of the box (or, out of the Block, if you prefer). 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.
Instead of manually adding coordinates for each one of your markers, just click-and-drop them directly on the map. You want to adjust their position? Just drag them wherever you want. And instead of filling-in custom fields to set each marker’s popup content, just open that popup and start writing in it, the Gutenberg way (it supports WYSIWYG editing, with links, images, and all). It even stores the map’s zoom level as you use it so that you don’t have to set it by hand.
[ootb_query] as an alternative way to use the aforementioned Query Maps feature (see the FAQ for more info).