I've looked into this quite a bit in the past and blogxen.com seemed to be the best although there are a lot of small bugs and features that are missing from it.
I've heard mixed reviews about rankwyz although I haven't tried it for myself so I can't really comment.
Most of the other tools available seem to be abandonware.
Ultimately I decided the best solution was to develop a custom tool to manage my networks and I think most people who are serious about this business end up doing the same or hire a VA.