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Firewall Test and Port Scan at AUDITMYPC
This online security audit is free, extremely fast and provides immediate results designed to promote security awareness.
www.auditmypc.com/

NetworkActiv - Network Security Tools
Suite of network exploration and administration tools. Performs network scanning, port scanning, network exploration, OS Detection. Free trial available.
www.networkactiv.com/

SQL Server 2000 Security Tools
Microsoft tool scans for instances of MS SQL Server 2000 vulnerable to the "Slammer" worm, and then apply updates to the affected files. Includes SQL Scan, SQL Check,and SQL Critical Update.
www.microsoft.com/

Vicomsoft Firewall and Internet Security Software
FAQs, White Papers, case studies and trial downloads of firewall and filtering software.
www.vicomsoft.com/

NGSSoftware
Security scanners and assessment tools for Oracle, Domino, and SQL Server. Checks for weak passwords and vulnerability to SQL injection and cross-site scripting.
www.nextgenss.com/

Avanton ReadyARM - Network Security Management Appliances
Appliance which provides the ability to monitor computer networks for unauthorized intruders and scan for vulnerabilities.
www.avanton.ca/

Proactive Windows Security Explorer
A password security test tool that's designed to identify and close security holes by executing an audit of account passwords, and exposing insecure account passwords.
www.elcomsoft.com/

TrustSight Security Scanner
Cross-Site Scripting, SQL Attacks,OS Attacks, Directory Traversal, cookie manipulation are tested. Claims not only to be able to find not only known vulnerabilities, but also potential new ones. CVE Compatible.
www.syhunt.com/

Network Security: Know Your Weaknesses
Review of six vulnerability scanners.
www.pcmag.com/

Retina Network Security Scanner
Identifies security vulnerabilities, suggests appropriate corrective actions and fixes. Free MyDoom, Nimda, DCOM, Sapphire SQL Worm, and Nimda scanner downloads.
www.eeye.com/