Ammonite

Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6400 potentially dangerous files/CGIs, checks for outdated versions of...

w3af is a Web Application Attack and Audit Framework

Burp Suite is an integrated platform for performing security testing of web applications. Its various tools work seamlessly together to support the entire testing process, from initial mapping and analysis …

Audit your website security and web applications for SQL injection, Cross site scripting and other web vulnerabilities with Acunetix Web Security Scanner. Download Free Edition!

Netsparker is the only False-positive-free web application security scanner. Simply point it at your website and it will automatically discover the flaws that could leave you dangerously exposed.

Websecurify is a powerful web application security testing environment designed from the ground up to provide the best combination of automatic and manual vulnerability testing technologies.

Firefox add-on that lets you change headers and request parameters before they're sent to the server. Unlike proxy request modifiers, it's integrated into the browser, so it has no problem …