I have a coworker on a team that is fairly distributed, fairly large (for our company) and wants to take advantage of visual management tools like scrum / kanban boards. Since they are a somewhat distributed team, though, all of the issue management / work management must be done via an electronic tool (we currently use Trac).
What issue / work management tools, with a visualization of a scrum / kanban board, do you use for your distributed scrum / kanban teams? would you recommend it, and if so, why?