Web server fingerprinting, directory and link extraction, Nikto and Google Hack DB scans.

Scans your ports and tells you which are open, closed, blocked etc.

Offers online security testing and provides a list of privacy tools to help make internet travels safer.

A web application vulnerability assessment product.

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

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.

Review of several vulnerability scanners.

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

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.