Toxyn Technologies, Inc. Hacking related group. http://www.toxyn.org/

Pulhas WebSite A collection of current hacker news articles. http://p.ulh.as/

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. http://www.11a.nu/

Cult of the Dead Cow Offers team background, tools and BackOrifice downloads, and news archive. http://www.cultdeadcow.com/

Twentythreedotorg SoCal's hacking group. Canadian free since 1999. http://www.23.org/

Progenic Security Security advice and exploits. http://www.progenic.com/

HackHull Group of hackers in the United Kingdom. Information about meetings, projects, and links to personal pages. http://www.hackhull.com/

Moloch Industries A New York hacker group. http://www.moloch.org/

The Dark Side Offers tutorials and articles on security related content, hacking, cracking, and network exploits. http://www.darknet.org.uk/

Digital Information Society Exploit archive, phreaking information, and group member pages. http://www.phreak.org/

Attrition.org Attrition is an eclectic collection of internet and computer security resources. http://www.attrition.org/

Synnergy Networks Security research site with quality papers and exploits http://www.synnergy.net/

CyberWarrior Main Base CyberWarrior specializes in tutorials, downloads ,and other information. http://cyberwarrior.gq.nu/

Crewl Underground Madness Belgian group specialized in computer and network (in)security, hacking, coding and phreaking. http://www.blackhat.be/

CyberArmy Internet security group focusing on internet deregulation. Also provides tools for anonymity, password cracking, port scanning, remote administration and firewalls. http://www.cyberarmy.com/

Razor Team of security researchers. Features news, original papers and advisories, presentations they have given, and tools they have written. http://razor.bindview.com/

TwistedinterneT ServiceS International Inc. Underground Hacker site with an extensive archive and library. http://www.twistedinternet.com/

HATE (Hackers Against Tyranny Everywhere) Anarchy, HAcking, Phreaking files for newbies. http://hnsg.net/

enZo Coding group. Offer hacking tools and vulnerability exploits. http://www.enZotech.net/

Netric Security Team Research site containing papers, tools, shellcode, exploit code, advisories and team projects. Portions are in Dutch, however the majority is in English. Majority of code available is written in C or asm. http://www.netric.org/