Community -- the community around GNU Hurd.
Trackers -- for reporting issues.
Mailing Lists -- preferred for general discussions, questions, bug reports, etc.
IRC -- for interactive discussions with a smaller audience.
Non-public mail contact to the maintainers.
If you have a concern you want to send to the Hurd maintainers without writing to a public mailing list, then please send email to firstname.lastname@example.org. Please don't send general support requests or questions there, but instead use the mailing lists.