I use Dropbox Paper (work at DBX too) and it’s quite amazing for the long form research notes - I’ll have like a million projects going and paper documents is just such a nice way to pick em up, write some stuff and then put it down again (and embeds online and file media really well). The free version is he one I use personally and it’s great! But it’s not the best for a large repo of short personal notes - I too am looking for something there (always wanted to get “in to” Evernote but just never did) - I actually use Todoist for small reference notes and material now.