- Gibson Research Corporation
- Privacy.net
- Wilders.org: Security Advisors
- Security Focus
- Computer Cops - Information Security - Portal & Forums
- CERT Coordination Centre
- WindowSecurity.com - Intrusion detection, antivirus, firewalls and more!
- Infosyssec: Security Portal For Information System Security Professionals
- NT Security
- Secunia: Alerts and Advisories against Vulnerabilities
- Information Security Magazine
- Computer Bytes Man
- Samspade.org
- Privacy & Security Page
- NSI's Information Security Resource Net
- Electronic Privacy Information Center
- World Wide Web Security FAQ
- The Security News Portal for Information Security System Professionals
- National Security Agency: Security Recommended Guides
- GovernmentSecurity.org: Computer and Network Security Articles for the Government
- UK Security Online
- Security Tracker: Keep Track of the Latest Vulnerabilities
- Waynes's Security Resources For Administrators
- Wilder Security Forums
- Broadband Reports Security Forum
- Broadband Reports Frequently Asked Security Questions (FAQ)
- Apocalypse Online - Computer Security for Security Experts
- Beyond Security
- UK Information Security, a resource and knowledgebase
- All Internet Security
- Center For Internet Security - Standards
- Securitydocs.com: The Information security library for the infosec pro
- Firewalls and Internet Security: Repelling the Wily Hacker (Online Book - First Edition)