There are so many out there, a few that I came across include:
Having a giant comparison table for this might be nice
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don’t control.
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I use the bookmark manager in Firefox, which I can search through.
Similar here. As I don’t need multi-user support, I don’t bother with self-hosting some tool.
Bookmarks go to Safari where they’re synced between all my Apple devices and pop up automatically in the address bar.
And long-term bookmarks (news articles, references, etc.) go into Anybox which keeps an offline copy of the website so I can still read it in 10-20 years.