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


I really like Readeck, it is very polished and the fact that it copies links content is very useful when saving Medium blog posts (and generally to make sure that I don’t lose the content if the linked page is ever removed)
Oh, nice. Saving the link’s content is exactly the feature I’ve been looking for.