A stress testing tool designed to test out your web server and web site. it can initiate multiple connections from ip aliases and simulated numerous (256+) users at any given time. the rate at which hammerhead attempts to pound your site is fully configurable, there are numerous other options for trying to create problems with a web site (so you can fix them).

http://hammerhead.sourceforge.net/ https://sf.net/projects/hammerhead/