For open source project management tools I prefer to use the integrated solution from Phabricator[1], nowadays called Phorge[2]. It has workboards, very good access control and separation of projects (tags). See an example board[3].
I see lots of people sing its praises, but (from the outside) it always seemed like it was kind of in limbo, not exactly abandoned but not exactly going somewhere either. I do see some recent activity <https://we.phorge.it/source/phorge/history/master/> so it's being developed by someone but I think https://we.phorge.it/T15801 squares with my concerns - there is likely a marketing problem for folks who aren't already in the know