Similar modules?

Problem/Motivation

I was looking for similar modules that are compatible with Drupal 11 (as this module currently isn't).

I just found:
https://www.drupal.org/project/allow_only_one →
which should be added to the list of alternatives, I think.

Any other similar modules?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes