Agileload - Load test tool from Agile Load SA for testing all types of web and mobile applications.

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Easily integrated into existing Dev stacks using partnership integrations and REST API.

Advanced Features include: AJAX/Web Services, XML/JSON Data Viewer, API data/execution.

Check listed tool/vendor sites for latest product capabilities, supported platforms/servers/clients, etc; new listings are periodically added to the top of each category section; date of latest update is shown at bottom of this page.

Also see Web Site Testing FAQ in the FAQ Part 2 for a discussion of web site testing considerations; also see What's the best way to choose a test automation tool?

in the LFAQ section; there are also articles about web site testing and management in the 'Resources' section. Free open source version supports the HTTP protocol, the $pro version supports binary protocols.

Go Replay - Performance testing tool that listens for traffic on production servers and feeds it to test and dev environments. Pro version supports replaying and keep-alive sessions to ensure that you get the exact same number of connections every time.

HTML reports can be generated during the load to view response times measurement, server CPU, etc. Loadster - Load testing tool from Brickyard Technologies, Inc.

oriented to testing websites, web applications, and HTTP web services; includes graphical script editor, live reporting, and unlimited virtual users.

Locust - Scalable user load testing tool written in Python.