I'm personally a big fan of Linkding [1]. You have to self host it, which means all the data stays local. I like the minimalist approach to the UI and there is a browser extension and (community created) mobile app [2]. Its also built on Django, which makes it pretty easy to manage/extend/modify.

[1] https://github.com/sissbruecker/linkding [2] https://apps.apple.com/nz/app/linkthing/id1666031776