GUUG hosts a number of mailing lists. Some are available to the public others are only for members.
The GUUG runs a Jabber server. That way members can use their @guug.de email address in the Jabber/XMPP network.
For events in the Unix/Linux and other areas that might be interesting for out members we have set up a calendar of events. Besides the events organized by GUUG you will also find events from other organizations.
In the GUUG Blog you’ll find conference reports, event announcements and news from the user group.
For planning and organisation we use the GUUG Wiki.