w3af - w3af is a Web Application Attack and Audit Framework
snort - Snort is a free and open source network intrusion prevention system.
Nikto - Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web...
Network Hotfix Scanner - Network Hotfix Scanner is a free advanced hotfix check utility that scans network computers for missing hotfixes and patches, and helps you download and install them, gives you a quick look at the hotfixes and patches installed or missed
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
Burp Suite - Burp Suite is an integrated platform for performing security testing of web applications.