The Gibberlings are global moderators as well as modders. They can be reached either on the forums or through the contact information in their profiles. The Staff page contains a list of all active Gibberlings.
Hosted Mods and Modders
G3 also hosts a number of other modders and their projects. The best way to find them is through exploring the forums and project pages. If you have a mod that you would like to see The Gibberlings 3 host, please contact any of the admins or Gibberlings.
G3 has a Discord server for general chat (mods and otherwise). While staff does hang out in there sometimes, the best way to get mod support is still on the forums.