Christian,
The project you are mentioning is called FSComm and can be found on the SVN source. The project is still under intense development with very limited resources and time. We are constantly looking for sponsors to make this dream possible, if you are a potential one, please send me and email offlist.
As for the project maturity, it is up to you to decide since only you know the features needed. We have users that use it on a daily basis and we have a couple of bugs filed that I still haven't had time to fix.
We welcome any type of criticism or request.
Regards,
Joćo Mesquita
FSComm Developer