Atlassian's product line suffers from the disjoint problem, which makes sense since they bought most of their products from other companies. To tackle this problem, you really have to have a unified base that all your tools are built on and it has to be flexible enough to work with any possible process and workflow.

My GitSense product is very similar to their fisheye product and due to how my system was built, I can actually integrate better with their own product line than fisheye can.