gkak.laₛ

I could’t find anything with a quick search, but maybe you could run the API server in an application container (e.g. Docker)? 🤔

For more simple use cases, some apps on Flathub might be enough, for example Comaps

(Also, I haven’t used JOSM in a while, but it might be worth checking that out as well to see if it can do want you want)

Element (the matrix chat app) has a “live location” feature (I haven’t had the need to look into anything else)

traccar.org

I’m also pretty sure that I’ve seen more than one relevant Nextcloud apps, but I can’t find one right now 🤔