There *is* the teamwork plugin available in the open-source community...I don't want to criticize it without knowing the roadmap, but I have not seen much activity on it, and we have not been able to get it to work in our environment due to bugs. So, I think there is still the need for a solution.
I've posted a related question on the forum here: https://groups.google.com/d/msg/staruml/PQBVF_x6nfk/gyz0AeJTAQAJ, and got response from StarUML team. Glad to see there is strong community support for the feature.
There *is* the teamwork plugin available in the open-source community...I don't want to criticize it without knowing the roadmap, but I have not seen much activity on it, and we have not been able to get it to work in our environment due to bugs. So, I think there is still the need for a solution.