Not that I do it myself, but I belive with an SDR dongle you could contribute to both aircraft tracking and naval tracking. Big communities out there for this at least.
It was an open community and then the person who ran the server sold it to a corporation for over a million dollars. I believe the community strongly dislikes the person and spun up their own website and server https://globe.airplanes.live/
I was picky about the ones I feed to.. community ones I feed to are adsb.fi, adsb.lol, airplanes.live, plane.watch, opensky-network, and on the commercial side, flight radar 24 and fightaware, both give premium access for feeding, which is nice.
I've got nothing against the owner of adsb.fi, but the owner pulled their data out of the community and wanted to go solo... or that's the stories I've heard, which might be biased against the owner.
Adsb.fi and airplanes.live were once in the same Discord server and worked together for several months rebuilding the community when adsbexchange sold out. I believe the original plan was to create a community where no one person could sell out and rug pull all of the donated data again, but I believe the owner of adsb.fi, Samuli, decided to take his data out of the community and go solo.
I've only heard one side of the story and so it might be biased against Samuli.
I would join his Discord server as well but I've used all of my server slots. It's a bit ridiculous of Discord to limit the servers a person can join, especially those who pay $10 for Discord nitro.