Some feature to organize plot by scene, mindmaps diagrams, structure the game session.
That's... a really vague request. Can you please expand on that?
Ptolus, City by the Spire - 2016 Campaign of the Year
"Please pay attention very carefully, because this is the truest thing a stranger will ever say to you: In the face of such hopelessness as our eventual, unavoidable death, there is little sense in not at least TRYING to accomplish all your wildest dreams in life." - - Kevin Smith
Like the concept, but I agree that a bit more of a firm outline would help.
I was thinking in something like a place to craft your plot, with possibilities of make links with npcs, pcs, another plots, and some other information perhaps (like maps, images), and structure the chronicle and plots in a mindmap.
You can do almost all of these things now, except the mindmap piece (if we're thinking of the same thing).
To me, a mindmap would be a page where you can drag and drop stuff anywhere onto the page. If that's what you're referring to, there's already a great tool for it. OneNote (PC) or EverNote (Apple) are free tools that can do this easily.
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