Found a “mind mapper” app for Linux only (unfortunately). http://www.insilmaril.de/vym/
I’ve already started using this to map out ideas, thoughts, concerns, known issues, etc., for a short film project I’m collaborating on. I think most people are like this to some extent, but I tend to think of ideas and concerns in a really scattered and nonlinear way. I’ve been using it for a day and I already feel a lot less scatterbrained.
This is an example, from the website.