Burp Suite is an integrated platform for performing security testing of web applications. It has multiple tools integrate in it. Two main tools in free version are Spider and Intruder. Spider is used to crawl the pages of the application and Intruder is used to perform automated attacks on the web application. Burp Has professional version in which there is a additional tool present called Burp Scanner to scan the applications for the vulnerabilities. Burp Suite can be downloaded from http://portswigger.net/burp/