You can reach us by e-mail or by using our trackers (e.g. our bug tracker). You can also join our mailing list and/or contribute to our wiki .
Apparently, in 2013, e-mail subscription to new releases is no longer possible via sourceforge directly. If you want to be notified, please try following the project on freecode.
Official mailing address
And responsible for the content of this page:
usegroup c/o Jochen Stärk Huswertstraße 14 60435 Frankfurt 069/56994020 (Festnetz privat) 069/56994018 (Festnetz firma+AB) 069/56994019 (Fax firma) 0177/4512645 (mobil)