wkhtmltopdf
Thank you so much! A long time ago I experimented with generating PDF files for job applications, because I needed layout capabilities and more than simple variable replacing, and while I found something and made it work, it didn’t support a lot of rather basic CSS. Which made me sad because I liked the concept of it (as much as I can ever like generating PDF files, anyway), and I love now knowing about this, it seems perfect :)
+1 for KeePassXC + SyncThing