MakeSecure.com is designed to facilitate discussion on security related topics, create network security awareness, and provide secure solutions.

CIAC publishes security bulletins and virus and hoax information. They provide computer security assistance to US Department of Energy (DOE) sites.

SANS Internet Storm Center - A global cooperative cyber threat / internet security monitor and alert system. Featuring daily handler diaries with summarizing and analyzing new threats to networks and internet security events.

Linux-Security Group, server administration, technical support and remote administration for dedicated servers, colocation servers, Apache web servers, e-mail servers, FTP file servers, and complete network-Internet security services, BioSecurity Anti Hackers

Established in 2003 to protect the nation's Internet infrastructure, US-CERT coordinates defense against and responses to cyber attacks across the nation.

Fee based security alert service that provides early warning of active attacks.

Fee based patch alert service.

Non-profit enterprise whose mission is to help organizations reduce the risk of business and e-commerce disruptions resulting from inadequate technical security controls.

SecurityFocus is designed to facilitate discussion on computer security related topics, create computer security awareness, and to provide the Internet's largest and most comprehensive database of computer security knowledge and resources to the public. It also hosts the BUGTRAQ mailing list.

eVuln.com - Penetration Tests & Security Advisories List