I use linkding https://github.com/sissbruecker/linkding

Have been hosting it for years, there’s a browser extension and a phone app by a third party developer as well.

I also tried readeck for a while but went back to lindking because of missing features

https://readeck.org/en/

There’s also linkwarden

https://github.com/linkwarden/linkwarden

Too colourful for me, can’t like the design

And there’s also karakeep

https://github.com/karakeep-app/karakeep