Xelenium is a security testing tool that can be used to identify the security vulnerabilities present in the web application. Xelenium uses the open source functional test automation tool 'Selenium' as its engine and has been built using Java swing.
Xelenium has been designed considering that it should obtain very few inputs from users in the process of discovering the bugs.
Selenium – Webdriver is an open source functional testing tool and is very powerful and flexible. More details on Selenium can be found here: http://seleniumhq.org/