My current project involves hardware design with Scrum as work method.
I'm looking for software which allows me to create work items, merge them, split them, combine them, categorise, etc.
I'm particularly interested in the management of user stories and requirements. There are requirements I know which I have a solution for, requirements I know that I don't have a solution. There are also requirements which are currently unknown, but have a specified topic (security, protocols, etc.). I want to list/categorise those requirements and link them with my work items.
Does any such software exist?
I don't care about stylish user interfaces as long as they're functional. Either Windows or Linux based.