Power Writer is the only one I know. And I'm rusty due to months of non-writing. (Been busy regaining health but am now healthier than ever.)
Power Writer has a learning curve but once through it the program is easy enough to use, though a bit more cumbersome than I'd like. It's not sim;le enough that I can just jump back in after a long break like this - I'll have some re-learning to do.
My main gripe though is that it doesn't seamlessly transfer back and forth with Word.
While doing the outline in Power Write I transfer a chapter, do my thing with it including corrections, resuffling, etc in the process of making the outline. Then it doesn't go back into Word the way I want - though I forget the specifics.
One thing, as I recall, it retains some of their own headings that can be 'hidden' within the program but remain in gray when I transfer the chapter back into Word. Not exactly what I want for a submission copy. I can do a massive 'find all and delete' but who wants the extra steps chapter after chapter.
There are other things too but I forget what they are.
Also it only allows a certain number of levels. I grew up with the old fashioned outline something this.
1
.A
..A1
...a
....a1
.....(a)
......(a1)
..A2
.B
..B1
2
etc
But I think you can only go
Project/Book name
Chapter
Scene
Scene
Scene
Sometimes I want more flexibility/depth than that.
Also I'm not sure what the problem is right now - I can't even open it. I've had a computer crash and replacement since I've had it plus a couple of reloads on this one after more minor crashes and I put it onto my laptop. It seems more prone to glitches and more vulnerable to power outages (we have many) than the computer itself is. (I have one of those fancy back-up batteries that closes everything before turning off the computer when the power goes out so it should be fine but ...)
Now it says I've run out of how many times I can load it. I can't go beyond that box. There's a contact process listed but I'm awaiting a new computer now so plan to wait until that is up and running to hassle it out with them.
Unless I can locate something I like better in the meantime.
For a program one pays good $$ for one ought to be able to use it without hassle - I think.