HackerThreads.org - Security Forum
Discussion forums with tutorials, Hacking programs and miscellanious threads.
HFX International Forum
Discussion forum for topics surrounding the underground, technology and the like.
Irvine Underground Forums
Discussion forum for Southern California security experts and hackers. [RSS]
Macintosh Underground Forums
Large Macintosh security and underground topic discussion forum.
SecureRoot
One of the worlds longest established hacking forums, offering resources covering everything from cracking to phreaking.
SecurityRisk.Org
Many topics and threads about Vulnerabilities, Hacking, Phreaking, and programming. Informative and active.
Social Engineering
Discussion forum about the insecurity of humans known as social engineering.
Spywire Forums
Forum dedicated to bringing knowledge to people starting out in hacking.
The Forbidden Web Archive
Security and Development Forum with a Security Basics Forum and Vuln-Dev.
