I dug into hoppscotch since my org balked at Postman enterprise costs, but was disappointed. It is open source and can run locally, but it still only talks to their cloud that stores your collections as a logged-in user (or session storage if you're offline). It's definitely a fledgeling commercial project, not a true open-source alternative, though you could fork it easily enough probably.

I had been hoping to keep all of our APIs centralized in git and run the local (or cloud for our ENVs) from that repo, but it doesn't read any query/API/collection defs from file.

(Not to come off as demanding of OSS, it's a wonderful product, but unfortunately you have to dig deep to figure out the limitations.)

EDIT: Also, what I'd go with now is Thunder client for VS code leveraging API defs stored within each repo + the localized vars such as auth info.