Nmap NT port
eEye has ported fyodor's nmap onto the NT platform.

Vulnerability Scanner Review
Network Computing's review of several commercial and open-source Vulnerability Assessment Scanners.

Audit my PC
Free online firewall test and port scan.

pcSuper Scanner
Proprietary scanner that can test all of the 65,535 communication ports on your computer.

VLAD the Scanner
A freeware scanner that checks for security problems referenced in the SANS Top Ten security vulnerabilities commonly found to be the source of a system compromise.

Angry IP Scanner
A freeware IP scanner for Windows. Display NetBIOS information, MAC address; save result to CSV, TXT, HTML or XML file.

SuperScan, SQLScan, BOping
Several security scanners, including a portscanner, a scanner for the Back Orifice, a scanner for Microsoft SQL Server "Slammer" Worm.

Nessus
Security scanner for Linux, BSD, Solaris, and other flavors of Unix. Performs over 900 remote security checks, and suggests solutions for security problems.

STAT Scanner
A vulnerability assessment tool for Windows NT and Windows 2000 Enables systems administrators to find and repair security vulnerabilities.

Cum Security Toolkit (cst)
Contains a cgi script scanner with 11 anti-IDS tactics and +2200 vulnerable scripts in the database; and a port scanner with banner grabber.

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

NeXpose
A security scanner that runs on Win2k/XP and Linux. It has an extensible rule engine and ships with over 1000 vulnerability tests.

Proactive Assessment Appliances
Network Vulnerability and Internet/Intranet Scanner Appliances.

xSharez Scanner
A multithreaded NetBIOS/SMB scanner providing information such as operating system, NetBIOS name, Workgroup, User name, Mac address. Generate advanced HTML and CSV reports. Check the vulnerability of Windows 95/98/ME using integrated password detection tool.

GFI LANguard
Provides information such as service pack level of the machine, missing security patches, open shares, open ports, services/applications active on the computer, key registry entries, and weak passwords. Remotely install security patches and service packs.

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

IP Range Scanner
This tool enables the user to retrieve a list of computer host names, logon account names, and MS IIS service status, and/or determine the use of non-LocalSystem accounts (used to start services).

Cerberus' Internet Scanner
Free security scanner (formally known as NTInfoscan). Performs SNMP, r* services, ICMP, TCP/UDP port scanning.

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.

Adslscan
Web security scanner, runs Nessus Scanner in ASP mode, no installation required.

Port Detective
Utility that detects which ports on your pc and your isp are open and available for hosting.

nCircle IP360 Vulnerability Management
An appliance-based solution that proactively discovers and assesses network vulnerabilities and exposures to protect networks and IP-enabled devices.

Nikto
A web server scanner which performs comprehensive tests against web servers for multiple items, including over 2200 potentially dangerous files/CGIs, versions on over 140 servers, and problems on over 210 servers.

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.

DominoDig
Audits Lotus Domino web servers. Produces an HTML report that provides a list of all the unique .nsf databases it was able to access, as well as IP addresses and email addresses.

MegaPing scanner
TCP and UDP portscanner and NetBIOS scanner, Displays installed service packs, open TCP and UDP ports, missing security patches.

THC-Amap
A port scanning tool which identifies applications and services even if they are not listening on the default port.

HFNetChkPro
Patch management tool scans Microsoft servers and desktops. Schedule and immediate remote patch scans and installations. Freeware and command-line versions available.

Infiltration Systems
Network security scanning software for detecting, auditing, and fixing network security exploits and vulnerabilities.

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.

SecurityMetrics Appliance - Network Scanner
Vulnerability Assessment, Intrusion Detection and Prevention.

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.

Saint Corporation
Network vulnerability assessment scanner.

Firewalk
Open source tool that tries to determine which protocols will pass through an IP firewall.

Filterrules
Description and download of the GPL-licensed firewall testing and documentation tool.

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.

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.

Network Security: Know Your Weaknesses
Review of six vulnerability scanners.

Portswigger.net
Web application security testing software. Product details, downloads, how to order and screenshots.

AppDetective
Penetration testing scanner that locates and assesses the strength of databases and web applications within your network.

MetaCoretex
A JAVA vulnerability scanner with a special emphasis on databases.

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.

Sussen
A security scanner which remotely tests computers or other devices and provides a report on their vulnerabilities.

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.

Domino HTTP security scanner
Security scan for Domino web servers.

Attack Tool Kit Project
An open-source utility to realize vulnerability checks and enhance security audits.

Arirang
A webserver security scanner based on twwwscan.

wmap
A web scanner which checks for files and CGIs in non-standard directories.

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.

FileMaker Pro XML Scanner
Free online tool to check the security of FileMaker Pro databases that are published on the web.

Atelier Web Security Port Scanner
TCP, UDP, NetBios scanner.

PortSense
Free online port scan of your firewall. Online network support tools: Ping, Whois, What’s My IP, Relaytester and more.

Nmap
Developers of NMAP, a network port scanner and service detector offering stealth SYN scan, ping sweep, FTP bounce, UDP scan and operating system fingerprinting. Downloads, documentation, security tools directory and a mailing lists archive. [Windows, MacOS, Unix]

Network Analyzing
Network scanning and auditing software which scans your network or webserver for over 20,000 exploits.

NetPenguin
Ping Scanner, Port Scanner and other network utilities.

YAPS
Intelligent IP port scanner

ISS
Internet Scanner Tool. Performs scheduled and selective probes of communication services, operating systems, applications and routers to uncover and report systems vulnerabilities that might be open to attack.

Beyond Security's Automated Scanning Server
Vulnerability assessment of internal networks or Intranets using an Automated Scanning Server.

Gherkin
Free security scan manager incorporating Nessus vulnerability scanning, dns and nmb lookup, host resolving, and nmap fingerprinting and scanning.

Visionael Security Audit
Software providing device discovery, scanning, prioritization, and report generation of vulnerabilities.

Firewall Auditing System
This website offers free firewall auditing. Useful for exposing any open ports on internet connected PCs. Registration is required.

IIS Vulnerability Scanner ver 1.0
Contains 1700+ server and file checks including hundreds of unicode and directory traversal vulnerability checks for IIS.

Spectator scanning tool
Scans Windows NT/2000/XP/2003 machines for P2P applications, remote-control applications, service packs, etc.

Web Security - Jamesmaurer.com
Offers online security testing and provides a list of privacy tools to help make internet travels safer.

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.

Immunity Canvas
Tests for over 50 exploits. Licenses include full source code.

MaxPatrol Security Scanner
Network security and web-application scanner with prediction capabilities.

Securescout perimeter penetration testing
Tests are performed over the Web to Internet-connected systems.

AutoScan
AutoScan is an application designed to explore and to manage your network. Entire subnets can be scanned simultaneously without human intervention. It features OS detection, automatic network discovery, a port scanner, a Samba share browser, and the ability to save the network state.

Maximum protection for web application gateway and data center security
We help businesses proactively secure customer and corporate information, protect web sites, prevent identity theft and block potential threats from malicious hackers