I was inspired by Frank's note taking program on the Zoom call, but I use Linux and can't use EverNote, so I went searching and found the free CherryTree Notes: giuspen.com/cherrytree/
They have downloads for Windows, Mac, and Linux.
It's a great note taking tool. It exports to PDF. It does not sync with devices or save to the cloud (that I can tell, which is fine for me). It does have it's defaults set really ugly, but they are easy to change. I did not like the cherries for bullets or the white text on blue background. But an easy change to make.
As a patient researcher, I think this will help a lot.