Siege is an http load testing and benchmarking utility. It was
designed to let web developers measure their code under duress,
to see how it will stand up to load on the internet. Siege supports
basic authentication, cookies, HTTP and HTTPS protocols. It lets
its user hit a web server with a configurable number of simulated
web browsers. Those browsers place the server “under sie".
Website: http://www.joedog.org/siege-home/