I’ve been using Zotero since I was in grad school and at one point wrote large chunks of the BibTeX export. My first papers were added to my library in October 2006. It’s amazing to have a single source of basically every paper I’ve read in the past 16 years and many books, newspaper articles, etc - including notes. I’ve always had it backed to my own WebDav server that has, somehow, survived despite numerous migrations.

The UI is starting to feel a bit clunky, but it’s fine as a standalone application and the mobile version is great too.