Fantastical 2 seems nice but sooooooo expensive...so I stay with BusyCal on Mac and Fatnastical 2 on iPad.
Also, I never got into brainstorming, my mind doesn't work that way I suppose but for simple thing MindMapple (https://geo.itunes.apple.co...
Regardless of the appearance as an obligatory pat on the back, nvALT is on my most used apps this year. I have switched from Evernote and still working through a learning curve (simplifying), but it's open almost daily.
Same. nvALT is indespensable. Although I am eyeing quiver (http://happenapps.com/#quiver) simply because of the organizational features it provides. Plain text is hard to beat though.