National Institute of Standards and Technology Computer Security Division
The NIST CSD develops information security standards and releases reports on a variety of information security topics.
SANS Internet Storm Center
The SANS ISC provides analysis of emerging information security threats.
United States Computer Emergency Readiness Team
The US-CERT provides timely information about current security issues, vulnerabilities, and exploits.
Open Information Security Foundation (OISF)
The Open Information Security Foundation is a non-profit foundation organized to build the next generation IDS\IPS engine.
Open Web Application Security Project (OWASP)
The Open Web Application Security Project is focused on improving the security of application software.