ShadowSecurityScanner
Shadow Security Scanner (network vulnerability scanner) has earned the name of the fastest ? and best performing ? security scanner in its market sector, outperforming many famous brands. Shadow Security Scanner has been developed to provide a secure, prompt and reliable detection of a vast... Shadow Security Scanner performs the system scan at such a speed and with such a precision so as to be able to compete with the professional IT security services and hackers, attempting to break into your network.
http://www.safety-lab.com/SSS.exe - 4Mb - Download - Screenshot

xSharez scanner
xSharez scanner is a multithreaded NetBIOS/SMB scanner designed for both network administrators and users interested in the network security issues. This software will help you to solve one of the most serious problems of all modern computer networks - unauthorized data access using NetBIOS/SMB... - Generate advanced HTML and CSV reports and analyze the network security level using this information. ... - Mount shared resources that are found by the program as network drives or simply browse them using Windows Explorer.
http://www.tools-for.net/download/xsharez3demo.exe - 1Mb - Download - Screenshot

MegaPing
MegaPing is the ultimate must-have toolkit that provides all essential utilities for Information System specialists, system administrators, IT solution providers or individuals. It includes: Scanners: Comprehensive Security Scanner, Port scanner (TCP and UDP ports), IP scanner, NetBIOS scanner,... Automatically detect security vulnerabilities on your network MegaPing security scanner checks your network for potential vulnerabilities that might use to attack your network, and saves information in security reports.
http://www.magnetosoft.com/downloads/megaping_setup.exe - 4Mb - Download - Screenshot

GFI LANguard Network Security Scanner
GFI LANguard Network Security Scanner (N. S. S. ) is a tool to audit network security and proactively secure it. It is also a complete patch management solution. GFI LANguard N. S. S. scans entire networks from a 'hacker's' perspective, and analyses machines for open ports, shares, security... Scan reports are customisable, outputted in HTML, and can be compared to previous scans, allowing you to easily see changes in your network. ... After it has scanned your network and determined missing patches and service packs - both in the operating system (OS) and in the applications - you can use...
http://software.gfi.com/languardnss7.exe - 15Mb - Download - Screenshot

SoftPerfect Network Scanner
A free multi-threaded IP,SNMP and NetBIOS scanner with a modern interface and several advanced features. It is intended for both system administrators and users who are interested in computer security. The program pings computers, scans for listening TCP ports and shows what types of resources... SoftPerfect Network Scanner can also check for a user-defined port and report if it is found open, resolve host names and auto-detect your local IP range. ... In addition, it allows you to mount shared resources as network drives, browse them using Windows Explorer, filter the results list and more.
http://www.softperfect.com/download/netscan.exe - 670Kb - Download - Screenshot

Infiltrator Network Security Scanner
Infiltrator is a network security scanner that can quickly audit your network computers for possible vulnerabilities, exploits, and information enumerations. It comes with a built-in database of know vulnerabilities, that can be updated online and allows you to select the items to scan for or to... It can also audit password and security policies, perform HTTP/CGI server auditing, registry auditing In addition, Infiltrator also comes with 18 network utilities for footprinting, scanning, enumerating and gaining access to machines (ping sweep, whois lookups, email tracing, share scanning and...
http://www.infiltration-systems.com/Files/infiltrator.zip - 1Mb - Download - Screenshot

Essential NetTools
Essential NetTools is a set of network tools for diagnosing networks and monitoring your computer's network connections. NetStat: displays the list of your computer's network connections, information on open TCP and UDP ports, IP address, and connection states. ... NetAudit (NetBIOS Auditing Tool): allows you to perform security checks on your network and/or individual computers offering the NetBIOS file sharing service. ... SNMPAudit: an SNMP device scanner that can discover SNMP devices in the selected network segment and receive customizable data from each of the devices.
http://www.tamos.com/files/ent4.zip - 3b - Download - Screenshot

Nsauditor Network Security Auditor
Nsauditor Network Security Auditor is a network security scanner that allows to audit and monitor remote network computers for possible vulnerabilities, checks your network for all potential methods that a hacker might use to attack it. Nsauditor is a complete networking utilities package that... The program also includes real-time network packet filtering and analyzing, remote network performance monitoring, network status monitoring, web proxy scanning, password auditing, intrusion detection system based on security events log analyzer, IP address lookup and more than 45 network tools...
http://www.nsauditor.com/downloads/nsauditor_setup.exe - 5Mb - Download - Screenshot

Acunetix Web Vulnerability Scanner
Is your website hackable? Audit your website security with Acunetix Web Vulnerability Scanner Hackers are concentrating their efforts on attacking applications in your website: 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. ... Acunetix Web Vulnerability Scanner - features: Ensures your website is secure against web attacks Automatically checks for SQL injection & Cross site scripting vulnerabilities Checks password strength on authentication pages (HTTP or HTML forms) Automatically audits shopping carts, forms, dynamic content and other web...
http://www.acunetix.com/vulnerability-scanner/vulnerabilityscanner.exe - 6Mb - Download - Screenshot

MonitorWare Console
MonitorWare Console is an analysis application for Windows event logs and network events. It offers live, interactive views and great reports. A number of helpful tools are included, even a network scanner. Reports can be scheduled for automatic generation. ... Great for security analysis. ... Included Reports cover Windows events, firewall reporting as well as generic network reporting. ... With MonitorWare Console, you can consolidate all of your Windows and network events into a single, easy to browse repository.
http://download.adiscon.com/mwconmin.exe - 16Mb - Download - Screenshot