So this reminds me, right around the Level0 I also finished the project I spent three months on, day to day. It introduced maps to multiple forum engines.
MapBBCode is primarily a way to mark a map data in bbcode, which is text. The hard thing was to make a series of libraries and plugins and modules to integrate it and Leaflet into engines like phpBB and FudForum.
And then it turned out, finding people to share supporting would be much harder.
The last editor I wanna mention is Maps.Me editor. I didn't make it all by myself, obviously, we had a brilliant team, and I just helped from sidelines.
It brought a hundred thousand new mappers to OpenStreetMap, although few of them stayed. In my few talks on this I argued it was the future of contributing: millions who don't care about the map, but bring the data.
Maps.Me got bought out, so now I recommend its fork, @organicmaps (pictured). Amazing how they still keep going. Support them.