XssScanner is a tool designed to help penetration testers find cross site scripting vulnerabilities. It analyzes a webpage to determine which are the payloads that could be used according to the position of the parameter. Then, for each selected payload, XssScanner sends a request using the payload and checks the returned page to find the payload. The major feature of XssScanner is its ability to detect many encodings that do not change the behavior of the payload (eg: double quote encoded into “).
You can download it from the following link: https://packetstormsecurity.com/files/download/107441/XssScanner.tar.gz
Source: https://packetstormsecurity.com/files/107441/XssScanner-1.1.html