HULK is a web server denial of service tool written for research purposes. It is designed to generate volumes of unique and obfuscated traffic at a webserver, bypassing caching engines and therefore hitting the server’s direct resource pool.
You can download it from the following link: https://packetstormsecurity.com/files/download/112856/hulk.zip
Source: https://packetstormsecurity.com/files/112856/HULK-Http-Unbearable-Load-King.html