I've worked with a few project management tools by now, but I can't really say that any of them would fit openclonks needs much better than the others. I just wouldn't recommend trac, but my experiences with that date back quite a while as well. As far as Release Management and Chart Tools go, I've never really made any use of it. Maintaining that stuff usually took more effort than it was worth. A combined timeline from repository, wiki and bugtracker is nice, though.