Metasploit Project, an open-source penetration testing tool that includes tests for XSS

w3af, an open-source web application security scanner

DOMPurify, a free and open source code library by Cure53 to reduce susceptibility to XSS vulnerabilities in websites.

Samy (computer worm)

image cross-site scripting

define cross-site scripting

wikipedia cross-site scripting

weblio cross-site scripting

kotobank cross-site scripting

jisho cross-site scripting