Attrition.org 
Attrition is an eclectic collection of internet and computer security resources.
Crewl Underground Madness 
Belgian group specialized in computer and network (in)security, hacking, coding and phreaking.
Cult of the Dead Cow 
Offers blog, team background, tools and BackOrifice downloads, and news archive.
CyberWarrior Main Base 
CyberWarrior specializes in tutorials, downloads ,and other information.
Digital Information Society 
Exploit archive, phreaking information, and group member pages.
Eleventh Alliance 
Offers details regarding select viruses, overflow and security exploits, bios tools, and crytography. Also features book reviews on assembly programming and computer security.
enZo 
Coding group. Offer hacking tools and vulnerability exploits.
HackHull 
Group of hackers in the United Kingdom. Information about meetings, projects, and links to personal pages.
HATE (Hackers Against Tyranny Everywhere) 
Anarchy, HAcking, Phreaking files for newbies.
Moloch Industries 
A New York hacker group.
Nomad Mobile Research Centre 
Hacker lab engaged in vulnerabilities research. Security papers, full disclosure advisories and current projects. Also features a FAQ on hacking techniques.
Progenic Security 
Security advice and exploits.
Pulhas WebSite 
A collection of current hacker news articles.
Razor 
Team of security researchers. Features news, original papers and advisories, presentations they have given, and tools they have written.
Synnergy Networks 
Security research site with quality papers and exploits
Toxyn Technologies, Inc. 
Hacking related group.
Twentythreedotorg 
SoCal's hacking group. Canadian free since 1999.
TwistedinterneT ServiceS International Inc. 
Underground Hacker site with an extensive archive and library.
Xfocus 
Organization dedicated to the research and demonstration of vulnerabilities in network services and communication security. Offers papers, security tools, exploit code, advisories and a discussion forum.
Attrition.org 
Attrition is an eclectic collection of internet and computer security resources.
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