CAT is designed to facilitate manual web application penetration testing for more complex, demanding application testing tasks. It removes some of the more repetitive elements of the testing process, allowing the tester to focus on individual applications, thus enabling them to conduct a much more thorough test. CAT uses Internet Explorer’s rendering engine for accurate HTML representation. It supports many different types of text conversions including: URL, Base64, Hex, Unicode, HTML/XML, SQL and JavaScript no quotes. It offers integrated SQL Injection and XSS Detection.
Source: https://thehackernews.com/2011/03/cat-web-application-security-test.html