Graphical server performance testing tool, for both static and dynamic resources (files or CGI, Servlets, Perl scripts). It may be used to simulate a heavy load on a server or network to test its strength or to analyse overall performance under different http://jakarta.apache.org/jmeter/index.html
A tool for automated testing of web applications and services. It can test individual components with HTTP interfaces, and is a test harness to create a suite of automated functional and regression tests. [Open source, GPL] http://www.webinject.org/
A HTTP-client/server load, stress and performance testing application designed to pinpoint critical issues in Web server that may prevent optimal performance. By Paessler GmbH. [Commercial, trial version] http://www.paessler.com/webstress
WAPT is a load and stress testing tool for web sites and intranet applications with web interface. Accurate load simulation, run-time test data generation, recording and play back of secure HTTPS requests, clear graphs and reports. [Commercial, trial vers http://www.loadtestingtool.com/
This tool checks the consistency of a web site and makes a load time analysis for all page elements. It provides a set of reports and statistic layouts representing web page download information. Available for various Windows platforms. [Commercial, trial http://www.web-site-test.com/
A Java load-testing framework. It has support for testing HTTP based services and can also be used to test MOM and POP3, SMTP, FTP, and LDAP applications. [Open Source, BSD-style license] http://grinder.sourceforge.net/
A Java-based performance testing and analyzing tool that helps application developers by automating the process of stress testing their server applications. This is achieved by simulating several hundreds of users performing tasks. Statistics are used to http://www.minq.se/products/pureload/