Nsauditor Network Security Auditor is a network security scanner that allows to audit and monitor 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 includes a wide range of tools for network auditing, scanning, monitoring and more.

You can discover network services and check them for vulnerabilities, list all TCP and UDP endpoints with their associated process, discover NetBios names, audit MS SQL servers, scan for common Adware traces and more.

The program also includes real-time network packet filtering and analyzing, web proxy scanning, password auditing, intrusion detection system based on security events log analyzer, IP address lookup and more than 40 network tools for scanning, sniffing, enumerating and gaining access to machines, DNS and WHOIS lookups, e-mail validation, HTTP traffic generator and intrusion detection based on security events log analyzer.

Overall, this is a very complete package for a surprisingly low price. The product contains a built-in database of known network security vulnerabilities, which allows you to select the items for scanning and add custom entries.