Notes for papers are great.
But I still use Excel to keep various categories of notes. Instead of just writing open-ended notes or maintaining text template, if there were excel-like fields that we could add or remote, then we could have forms style notes. I use this strategy to maintain my notes as well as collaborate with others. Eg fields, summary, pros, cons, assumptions, video demo links, etc. Or you could allow people to add custom fields in the edit form.