There are so many out there, a few that I came across include:
- Wallabag ( GitHub, Website): Older, long history, somewhat clunky now?
- LinkWarden (Website): Focus on multi user and teams?
- Raindrop.io (Website)
- Omnivore (Website)
- Hoarder (GitHub)
- Shiori (Article)
- Readeck (Website)
Having a giant comparison table for this might be nice
Linkwarden. Because it has a good design, tags, is selfhostable, has some nice integrations (browser-plugin, PWA) and saves backups of the bookmark in PDF.
Linkwarden maintainer here, thanks for the shoutout and stay tuned for exciting updates as we have lots of new features lined up for the next release :)