A website of sporadically updated tools, projects, and documents. Most code is in perl, but the site offers eloquent exploits and presentations.

fyodor brings us Insecure.Org, the home of nmap. Nmap is the most commonly used port scanner and service detector used in the land of unix. This site also has a fairly outdated vulnerability archive, and scanning related technical papers.

ISISi is a group effort between Alldas, OSVDB, and Vulnwatch to bring together some of the top, open source, and community driven security sites. This effort is a great step forward for the community.

A non-profit informal organization responsible for excellent papers on assembly code, and kernel level vulnerabilities. Several research projects, and dozens of original advisories.

A research and development site containing papers, code, advisories, special projects, and a few links. Portions are in Dutch, however the majority is in English. Majority of code available is written in C or asm.

NMRC is an excellent resource for security related papers, advisories, projects, and general information. NMRC is a well known contributor to the hacker underground.

The concept of the OSVDB was introduced as a method of implementation for an unbiased, vendor neutral vulnerability database for utilization by individuals involved in the information security community. The overall goals of the project are to promote greater, more open collaboration between companies and individuals, eliminate redundant works, and reduce expenses inherent with the development and maintenance of in-house vulnerability databases.

Packet Storm is an extremely large and current security tools resource.

TESO is an international group of young and motivated computer programmers and security enthusiasts. Responsible for a small army of privately released exploits.

enZo is a small coding group working on small projects, slowly releasing tools and advisories and furthering research on existing vulnerabilities.