1. FWPTT – fwptt it’s a Web application tester program for load testing web applications. It can record normal and ajax requests. I tested it on asp.net applications, but it should work with jsp, php or other.

Current version 8

Get it here – fwptt

2. Grinder: A Java-based load-testing framework freely available under a BSD-style open-source license. Orchestrate activities of a test script in many processes across many machines, using a graphical console application. Test scripts make use of client code embodied in Java plug-ins. Most users do not write plug-ins themselves, instead using one of the supplied plug-ins. Comes with a mature plug-in for testing HTTP services, as well as a tool which allows HTTP scripts to be automatically recorded. Requirement: OS Independent

3. Siege – Siege is an http load testing and benchmarking utility. It was designed to let web developers measure their code under duress, to see how it will stand up to load on the internet. Siege supports basic authentication, cookies, HTTP and HTTPS protocols. It lets its user hit a web server with a configurable number of simulated web browsers. Those browsers place the server “under siege.”

Get it here – Siege

4. Stress Tools By Microsoft

WCAT – Web Capacity Analysis Tool (WCAT) is a lightweight HTTP load generation tool primarily designed to measure the performance of a web server within a controlled environment. WCAT can simulate thousands of concurrent users making requests to a single web site or multiple web sites. The WCAT engine uses a simple script to define the set of HTTP requests to be played back to the web server. Extensibility is provided through plug-in DLLs and a standard, simple API.

5. Deluge Web site load tester. Simulates multiple user types and counts. Includes proxy server for recording playback scripts, and log evaluator for generating result statistics.