kando allows you to manage a kanban board very simply. You can create a new project or join an existing one thanks to its ID.
When you are the administrator of a board, you can manage the users who have access to it, name it administrator or delete it.
Kando is free and totally customizable, you can move your cards with a simple drag and drop.
Each card has a detail view on which you can assign it to a person, add a description or even add tags.