LightCat

LightCat is a Product Management tool built around Product Knowledge as opposed to bug tracking and todo lists.

It is used by elite Product Teams across the world that focus on customer knowledge and use a scientific decision framework to design roadmaps.

LightCat has two core features - 1) Scribbles - The Product Knowledge Tree and 2) Storyboard - The Product Decision Framework

It's a blessing if you want to avoid opening JIRA but still use it ;-)