OpenSSH: www.openssh.org
OpenSSH Mailing Lists: openssh.org/list.html
Debian Mailing Lists: www.debian.org/MailingLists/subscribe
Red Hat/Fedora Mailing Lists: www.redhat.com/mailman/listinfo
SUSE Mailing Lists: www.suse.com/us/private/support/online_help/mailinglists/index.html
SecurityFocus SSH Mailing list: www.securityfocus.com/archive/121
John The Ripper: www.openwall.com/john
Nessus Vulnerability Scanner: www.nessus.org