Yeah it’s a maybe, uLogger seems to let you choose which track you want to see. I presume the app lets you log to a specific track so you can have one for each person.

It might depend on what specific experience you’re looking for. For example, I log to Nextcloud and can view it there, but this is more of a “find my phone” plus tracking where I’ve been for myself (similar to Google Location History). While I’m sure I can set it up so others can see, it’s not really designed for it. It would also be a bit awkward as you’d have to log in to Nextcloud in a browser to see the locations (seems it’s possibly the same for uLogger).

I also run Home Assistant for home automation. I trigger automations off of my wife and my locations, but either of us can open the app and see at a glance where the other is (with pre-defined locations, such as “Home”, “School”, “@Dave’s Work”, etc, plus the ability to tap and see the exact location on a map).

That Home Assistant setup is much more useful for either of us seeing where the other is than I think the more dedicated tracking apps are, since they aren’t designed around sharing your location with others and that’s more of a side-function.