| 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. | |
| Western Massachusetts 2600 chapter Place for pictures and information pertinent to the monthly 2600 meetings held in Western Massachusetts. | |
| TwistedinterneT ServiceS International Inc. Underground Hacker site with an extensive archive and library. | |
| Twentythreedotorg SoCal's hacking group. Canadian free since 1999. | |
| Toxyn Technologies, Inc. Hacking related group. | |
| Toronto 2600 Canada's Largest Hacking and Phreaking meetings. Picking up where the great Hack Canada left the Edmonton 2600 meetings in 2002. | |
| Synnergy Networks Security research site with quality papers and exploits | |
| San Francisco 2600 Where hackers, crackers, phreaks, and geeks hang out and discuss technology and network security with other like-minded folks. | |
| Reading 2600 Pennsylvania group. Meeting information and links. | |
| Razor Team of security researchers. Features news, original papers and advisories, presentations they have given, and tools they have written. | |
| Pulhas WebSite A collection of current hacker news articles. | |
| Progenic Security Security advice and exploits. | |
| 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. | |
| Moloch Industries A New York hacker group. | |
| Los Angeles 2600 One of the longest-running and most active 2600 meetings, complete with information on how to find it and reviews of past meetings. | |
| Las Vegas, NV 2600 First friday of every month at 8PM in the Wow Superstore located at Sahara + Decatur. | |
| HATE (Hackers Against Tyranny Everywhere) Anarchy, HAcking, Phreaking files for newbies. | |
| HackHull Group of hackers in the United Kingdom. Information about meetings, projects, and links to personal pages. | |
| enZo Coding group. Offer hacking tools and vulnerability exploits. | |
| 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. | |