I actually use several of the sponsors of NaNoWriMo. My Favorites are:

Dabble since it was in Beta form. ($10 monthly) Dabbler is a lot like Scrivener but is cheaper. NeedingBeachDuf 🐠⛵🏝️ might be able to tell just what differences there are?

Writing Mastery Academy since last year's NaNo ($12 monthly) though it is going up to ($15 a month) still well worth the money. Especially if you use Save A Cat Writes A Novel by Jessica Brody. She runs the Academy.

I also like Jessica Brody recommend Trello it is free for the first 8 Story Boards and then after that it is pretty cheap. Right now it still free for me as I only have 5 Story Boards

The other one I recommend is Novel Factory. ($20 monthly) for Unlimited .Novels.