I’ve been really enjoying Dabble.
First off, I would not consider myself a writer. Not in the way most people think anyway. However, I’ve found myself writing (or trying to write) adventure modules for RPGs like Dungeons & Dragons. The way Dabble lets your organize your story and visualize the adventure plot/sub-plots makes this the perfect tool for creating rich RPG adventures. The Story Notes section is perfect for adding NPC information and world notes. This is an invaluable tool for writing an RPG module.
I used to use Scrivener for all of this, and it was pretty good. My problem with Scrivener was that it became too bloated with features I’ll never use, kind of like Word. Dabble is streamlined and does exactly what I need.
Looking at the Roadmap, I see “Character tools” on the distant horizon. I’m very excited about this feature.