A handful of text files containing sets of passwords of similar "privilege level" (e.g. one containing social media logins, one for PayPal or services that cos

A handful of text files containing sets of passwords of similar "privilege level" (e.g. one containing social media logins, one for PayPal or services that cost money, etc), stored gpg-encrypted to specific lists of people and kept under revision control. It is cumbersome, particularly with regard to editing and key management. But it works and doesn't rely on any 3rd parties.