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 differ...

Project to build a distributed Web load testing architecture based around CORBA. [Open Source]

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]

Developer of web application testing and analysis software to verify the performance, scalability, and integrity of e-business applications. [Commercial]

Load, stress, and performance testing software and tools for Web servers. Interactive reports tell how many real users a Web site can handle at one time and which Web pages are slow. [Commercial]

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]

Offers software-testing-related services and, on its site, articles and presentations about performance testing written by Scott Barber.

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]

Offers NeoLoad, a testing tool for web applications which provides monitors and results reports to pinpoint bottlenecks and performance issues, as well as application deployment services. [Commercial, trial version]

The Advanced .NET Testing System (ANTS) is for load and scalability testing of .NET web services and other web applications. [Commercial, trial version]