Meet my favourite project management tool - a plain paper notebook. It's super thin, usually lasting me a few weeks. It's only RM2, about US$0.40 from Mr DIY. I choose these because it has pretty covers and I like thin notebooks because they are more portable and I get the dopamine hit when I choose a new notebook a few weeks later with a pretty cover.
It contains my brain dumps, tasks, project notes, rants and ideas. It's simple and messy and I love it.