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.