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

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

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.

An open-source utility to realize vulnerability checks and enhance security audits.

Network security and web-application scanner with prediction capabilities.

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.

Wapiti acts like a fuzzer, injecting payloads to see if a script is vulnerable.

SQL scanner capable of enumerating entire remote databases, and perform an active database fingerprinting.

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

A web-based interface for the Nessus vulnerability scanner and a backend queue manager for scan requests. Allows users to hierarchically manage networks of hosts, scanning policies, and automated scans.