It’s named linkhut and it’s currently able to import your bookmarks from pinboard and browser exports. The flagship instance is: https://ln.ht
The source code is hosted here: https://sr.ht/~mlb/linkhut/
The documentation: https://docs.linkhut.org/introduction.html
The two things that are important to me in a bookmarking app (and why I‘ve been working on making one of my own on and off for a while): open source and offering an API for other tools to build upon.
The current API on linkhut aims to be bug for bug compatible with pinboard while being more OAuth-y.
I’m still working on an archiving feature similar to pinboard’s. But it’s probably going to take a while, I’ve been experimenting with different approaches and there’s still a few things I want to explore before settling on a solution. Once that’s ready I think I’ll call 1.0 complete.
In the meantime I’m still working through a laundry list of quality of life and small features (e.g.: recently I pushed support for “unread” links).