The only thing slightly different that I self host is WebODM. It's open drone mapping software. You can upload 10s or 100s of photos of an area and it can generate an orthomosaic, kind of like Google maps. It has a lot of other features too.
I don't really use it, I just play with it from time to time.
Yes. It's mainly used for construction, people will map a large construction site once a week or so, so that executives can see the progress.