Last month I downloaded the Freemind (mind mapping) app after seeing it recommended here - in preparation I learnt how to use the app @Youtube Uni.

Freemind:
As a very visual person, I found it really helpful to see my ideas all in one space. It helped me to work out the initial flaws and changes I needed to make. It helped me to see which areas were lacking, and/or not even needed.

I found it good in the very early stages. As soon as I tried to fill up the bubbles with much more information it looked a visual mess and was not useful anymore.

Recent Brainstorming:
For the recent brainstorming, I just made a list, started with the first thing that popped into my mind, and then just wrote down every ide after that. I did not leave any idea out, cause that's what I thought brainstorming was!