Jon Polish wrote:

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.

I couldn't tell from your comment which outliner just gained footnote support. Please enlighten me. That's a feature I've wanted in an outliner forever, if the footnotes can be exported to HTML.