Ask HN: How do you organize your team's TODO list?

Our team of five (IT) has the freedom to do some side projects in addition to general duties.These duties are also a lot research oriented and not very predictible.

We struggle with having a shared TODO list which would be used to

- pick an previously agred upon subject for someone who has free cycles

- give an overview of the status of said subjects

I am not loking at formal projecttracking or billing, rather something which would be easy to use for a mostly independent team.

We are trying wekan but it somhow doesn't get buy in (not sure why yet, maybe it does not work that well for a team vs. an individual?), despite an overall will to have a tool (we all realize we need one)