I've now had a closer look at O4D and played with it a bit.
I can now remember investigating it before and discounting it then on the basis of its age and abandonment. Now its quite a few years older, and longer abandoned - but much cheaper. And I have never been put of buying a program because it is no longer being developed, if it will do what I want now. Seems to use only a limited number of RTF features - no tables, no images - but it is quite a nice environment for writing and I find the timeline feature quite helpful, though I don't think I use it in the way that the writers expect. But then, I'm not a screenwriter.
My favourite writing environment remains TreeDBNotes - also largely frozen in time, but then virtually all outliners seem to be - but O4D seems to help more with keeping the mass of a really long text in the mind; or so I anticipate. But it doesn't help keep info, sources etc available in the way that Scrivener and TreeDB can. But very easy to use for the pure writing.
While I was looking around, I also found that Aeon Timeline
had finally made its way to Windows, so that was an extra, and unexpected, gain.
However, I don't think the "Timeline View" feature works too well. If you're interested in "horizontal" outlining (writing in adjacent linked columns), as opposed to "vertical" outlining, then I'd recommend Gingko App for that, or even Freeplane. Here is my Gingko review/mini tutorial, if that's of interest.
I had a quick look at Gingko but anything that relies on web access will too often be inaccessible for me to rely on.
I have Freeplane, but never found myself using it that much. Has always felt a bit fiddly, but I've only felt I needed mindmaps every now and then and just use the program that seems to give the best presentation for what I have in mind at the time.
Also looked at the rest of your workflow and ConnectedText. But CT seems to be too much keyboard for me to cope with, and, for some reason, I've never tended to get on well with wikis. I will probably go on relying on Evernote, OneNote and TreeDB for these functions (and SearchEverything). And I can see that I will just do more and more in Evernote. It requires no thought, allows me to do virtually everything with the mouse, is easy to dump everything into it and I could
organise it if I wanted to.