OrganizeWP
I built OrganizeWP to scratch my own itch when building client sites. I was always put off by the way content types were represented in the WordPress Administration area. It felt disjointed. OrganizeWP fixes that problem.
OrganizeWP builds an outline of your site upon the structure as defined by your Pages, which anchor everything. Custom Post types are integrated within a single outline view to better visualize the content if your site as a whole.