A couple of other underappreciated tools I've found in writing stuff are things that help with writers' block and determining what would happen. In my case, the Mythic Game Master Emulator[0] and the Adventure Crafter[1] from Word Mill Games have been quite helpful last NaNoWriMo. They may have been designed for roleplaying games but man do they help with a story in a pinch, not to mention the billion and a half tables of random things on DriveThruRPG.
[0]: https://www.wordmillgames.com/mythic-gme.html
[1]: https://www.wordmillgames.com/adventure-crafter.html