I think home assistant + the home assistant app will do this, although i have disabled map etc from HA so I dont have 1st hand experience. You need to self host HA and establish a connection either with nabu casa cloud or a vpn setup (it’s quite easy to set up wireguard on HA)

Doesn’t do collaborative online editing and that seems what this is about. But there are foss alternatives already, collabora/nextcloud, cryptpad etc.

There is nextcloud and others you can self host at least.