Linkding which is like pinboard but self hosted. Just because it’s simple. I could do with just using browser sync but hey, I’ve got a server running so I might as well host it
As an aside you can use Nextcloud’s WebDAV to sync Joplin if you wanted to reduce the number of services running on your server. Not sure how it compares in performance though.
I use https://wekan.github.io/ for tracking items to repair.