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].
1. https://www.phacility.com/phabricator/ 2. https://we.phorge.it/ 3. https://we.phorge.it/tag/phorge/