NScan
It includes network/host scanner, a set of additional features currently limited to whois and traceroute and numerous options to fully customize the scan process.
N-Stealth Security Scanner
Vulnerability-assessment product that scans web servers to identify security problems and weaknesses on local and remote web servers. Commercial and free editions are available.
Online Security Check
Free firewall, privacy and browser security test.
Online Vulnerability assessment ASP with graphical network display, updated daily
Online vulnerability scanner which scans for SANS "top ten" vulnerabilities.
Oracle Security Scanner
This script looks for certain security issues within an Oracle database. This scanner accompanies a white paper published on security focus at http://www.securityfocus.com/infocus/1522.
PatchQuest and ScanFi
Automated patch management and vulnerability assessment software for scanning, distributing and managing patches, security hotfixes and updates across heterogeneous networks comprising Windows, Red Hat and Debian Linux systems.
Port Detective
Utility that detects which ports on your pc and your isp are open and available for hosting.
PortSense
Free online port scan of your firewall. Online network support tools: Ping, Whois, What’s My IP, Relaytester and more.
Portswigger.net
Web application security testing software. Product details, downloads, how to order and screenshots.
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.
Retina Network Security Scanner
Identifies security vulnerabilities, suggests appropriate corrective actions and fixes. Free MyDoom, Nimda, DCOM, Sapphire SQL Worm, and Nimda scanner downloads.
Saint Corporation
Network vulnerability assessment scanner.
Securescout perimeter penetration testing
Tests are performed over the Web to Internet-connected systems.
Securing your unix, as400 and vax systems - for os400 and openvms
Non-intrusive software tool which will review the security of Unix, OS400 and OpenVMS systems.
SecurityMetrics Appliance - Network Scanner
Vulnerability Assessment, Intrusion Detection and Prevention.
Shadow Security Scanner
Offers vulnerability auditing modules for many systems and services. These include: NetBIOS, HTTP, CGI and WinCGI, FTP, DNS, DoS vulnerabilities, POP3, SMTP, LDAP, TCP/IP, UDP, Registry, Services, Users and Accounts, password vulnerabilities, publishing extensions, MSSQL, IBM BD2, Oracle, MySQL, PostgressSQL, Interbase, and MiniSQL.
Spectator scanning tool
Scans Windows NT/2000/XP/2003 machines for P2P applications, remote-control applications, service packs, etc.
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.
STAT Scanner
A vulnerability assessment tool for Windows NT and Windows 2000 Enables systems administrators to find and repair security vulnerabilities.
SuperScan, SQLScan, BOping
Several security scanners, including a portscanner, a scanner for the Back Orifice, a scanner for Microsoft SQL Server "Slammer" Worm.
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