If there's any reason for you to contact the administrator through a private channel without signing up; on this page you can find the e-mail address through which you can do that.
Questions or reports regarding the site and its operation are welcome if you are unable or unwanting to ask these through the forum or the chat. Legal takedown notices (DMCA etc.) are also to be sent to this address.
The list of source code repositories that could previously be found on this page is now here.