Dr Andus wrote:

Maybe WorkFlowy, Scrivener, Whizfolders and Outline 4D could also be
added to this list? (Although O4D is unlikely to ever get another
update, and Whizfolders also hasn't been updated for quite a while).

Actually Sanjay (the developer) has recently added footnotes and endnotes to the program. I have been asking for these additions for years and they work really well in the beta he sent me. Yes, development is slow, but that is because the program is mature and very stable.

Jon