I use Zotero, which is open source, and sync it between my devices using syncthing. I know this may not be considered self-hosted by some, but it does put you in charge of your data.
Can I install Zotero on my server ?
It can be set up to work with a webdav database. So yes, you could self-host the database and access it from clients with local zotero installs.
I have been using Zotero for a while and syncing my library directory with Syncthing, even though they say not to (no problem in 7 years including PhD and job).
If you want something even more minimalist, it is possible with the command line too, , which is the approximate setup I'm currently using in my pharma job.
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
Beginning of January 1st 2024 this rule WILL be enforced. Posts that are not tagged will be warned and if not fixed within 24h then removed!