HackerThreads.org - Security Forum
- Discussion forums with tutorials, Hacking programs and miscellanious threads.
- http://www.hackerthreads.org/
Social Engineering - Discussion forum about the insecurity of humans known as social engineering. - http://www.socialengineering101.com
Spywire Forums - Forum dedicated to bringing knowledge to people starting out in hacking. - http://spywire.net/forum/index.php
SecureRoot - One of the worlds longest established hacking forums, offering resources covering everything from cracking to phreaking. - http://www.secureroot.com
The Forbidden Web Archive - Security and Development Forum with a Security Basics Forum and Vuln-Dev. - http://www.forbiddenweb.org/
HFX International Forum - Discussion forum for topics surrounding the underground, technology and the like. - http://forum.hfactorx.org/