What public resources do you feel are overlooked/underrated?

I know in my country (which is experiencing a very bad homelessness epidemic), post offices provide services to register a permanent address and collect mail from them. This isn't very well known sadly, and if it was more widely advertised we could have seen better voter turnout in our most recent election for example. Not without mentioning access to education and jobs that require permanent addresses, which would help homeless people out of the poverty cycle.