Further contact info for specific services may be given on the respective service page.
Currently the following people are in charge and willing to have their identity given here:
You can contact the netwichtig.de hostmaster via email:
hostmasternada AT netwichtig.de
There is a help channel at ircs://irc.netwichtig.de:6697/#help, hopefully filled with knowledgeable users and some admins.
You can open a bug, feature, or support ticket if you think something is wrong with anything regarding netwichtig, would like to make a suggestion, or require assistance using one of the services, if you just need someone to talk, etc. Almost all input is welcome!