WebInject is a free tool for automated testing of web applications and web
services. It can be used to test individual system components that have
HTTP interfaces (JSP, ASP, CGI, PHP, AJAX, Servlets, HTML Forms, XML/SOAP
Web Services, REST, etc), and can be used as a test harness to create a
suite of [HTTP level] automated functional, acceptance, and regression
tests. A test harness allows you to run many test cases and collect/report
your results. WebInject offers real-time results display and may also be
used for monitoring system response times.