XSSer is an open source penetration testing tool that automates the process of detecting and exploiting XSS injections against different applications. It contains several options to try to bypass certain filters, and various special techniques of code injection.
You can download it from the following link: https://packetstormsecurity.com/files/download/154573/xsser_1.8-1.tar.gz
Source: https://packetstormsecurity.com/files/154573/XSSer-Penetration-Testing-Tool-1.8-1.html