Avenza seems to be the go-to app nowadays. It works pretty well and all, but I’m wanting to know if there’s any software available that can allow a team of people to simultaneously access and make edits/notes to a geo-referenced map.

So, just for one example, I could add a placemarker on the map, and any of my team members who are also accessing that map will be able to see (in real time) the placemarker that I just made. Does this type of feature exist?