How to have only one login for multiple websites on the same linux machine?

I’m having multiple websites (like mediawiki, gitea and kanboard) and im thinking about making the login the same on all services.

But how do I do that?

I looked at AD but I read that it’s Windows only?
I also heard about “FreeIPA” but I read that it’s used for linux client machines?
Google is sadly not really helping me with that, as the question is too broad to get good results.

All I want is to make the logins on all my websites the same, so that if I create a user (or change password) once it gets updated on every website/service.
I don’t necessarily need the client OS (example: windows login) to be involved, but if that is necessary then I will do that.

Any help or directions would be greatly appreciated.

BR
Chris

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Author: Chris