OsmAnd data is basically inaccessible outside the app. I can’t see my markers and places on a browser

Wait so you add poi, like store and etc, locally but not on osm? Because if you add them to osm they can be seen on a browser

But if you mean personal poi then the sentence make another sense

There is https://github.com/spacebarchat/spacebarchat too that some time ago was fosscord and it’s literally a self hosted discord!