Mazu Profiler - Internal Network Security and Network Security Systems
Mazu Profiler uses network behavior analysis (NBA) to enable IT organizations to manage, secure, and optimize availability and performance of business services
http://www.mazunetworks.com/

ESTec Security
ESTec Systems Corp. offers information security consulting, policy and procedure development, certified audit assistance, ISO 27001, ISO 17799, BS 7799 implementation services.
http://www.security.estec.com/

TriGeo Network Security, Inc.
TriGeo is the first industry security information event management solution to combine real-time log analysis, event correlation and active response in an affordable network appliance. With TriGeo, meeting IT security regulations is easier than ever.
http://www.trigeo.com

eEye Digital Security
Enterprise endpoint security and vulnerability management solutions. Retina is an industry leading vulnerability assessment tool and Blink Endpoint Security delivers the most comprehensive solution integrating anti virus, anti spyware and anti-malware solutions in a single client.
http://www.eeye.com/html/

Network IT Security
A small mobile company focused on network vulnerability detection, network intrusion protection, and security compliance. Located in Boise, Idaho.
http://www.networkitsecurity.com

Silk Road
IP network management, scalable network design, security systems engineering, and network security risk assessments.
http://www.silkroad.com/

Network Security Information: UNIX
WindowSecurity.com provides Windows security news, articles, tutorials, software listings and reviews for information security professionals covering topics such as firewalls, viruses, intrusion detection and other security topics.
http://secinf.net/unix_security/

Breach Security, Inc.
Web Application Security - Breach Security protects against web attacks bypassed by network security and coding flaws to keep organization's sensitive information secure.
http://www.breach.com/

Security Focus
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.
http://www.securityfocus.com

Network Security Forum
The Network Security Forum is a place to discus topics on Security, Linux, Wireless, Hardware, Software, Operating Systems, etc.
http://www.networksecuritytech.com