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.
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.
Twentythreedotorg - SoCal's hacking group. Canadian free since 1999.
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.
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