PocketSoap

GUI-based packet capture tool. Packet data is captured and displayed between local client and web server. Captures can be saved to disk. Available for Windows, binaries and source. PocketXML-RPC and PocketHTTP also available.

Httperf

Httperf is a tool for measuring web server performance. It provides a flexible facility for generating various HTTP workloads and for measuring server performance. The focus of httperf is not on implementing one particular benchmark but on providing a robust, high-performance tool that facilitates the construction of both micro- and macro-level benchmarks. The three distinguishing characteristics of httperf are its robustness, which includes the ability to generate and sustain server overload, support for the HTTP/1.1 and SSL protocols, and its extensibility to new workload generators and performance measurements.

vPerformer

Verisium vPerformer is a product that can be used assess the performance and scalability of web applications. vPerformer reveals the behavior of your web application when it is subject to extreme stress. You can measure the performance characteristics of your application by generating automated test scripts and replaying either recorded or customized test scripts that simulate thousands of concurrent virtual users.

In addition to showing you the performance characteristics of your own application, vPerformer enables you to monitor the state of any associated external component that influences the behavior of your application. These components include web servers, application servers, database servers, operating systems, network devices, and SNMP implementations of various vendors. This allows you to identify performance bottlenecks and pinpoint the source of the performance problem.

Features:
-user-friendly interface based on point-and-click operations
-uses the industry standard JavaScript language
-vPerformer can simulate thousands of virtual users while placing a negligible load
-roup recorded HTTP requests by web page or it can record each HTTP request individually.
-Support for multiple platforms, browsers, web servers, application servers and database servers over a LAN or WAN.

Hammerhead 2

Hammerhead 2 is a stress testing tool designed to test out your web server and web site. It can initiate multiple connections from IP aliases and simulated numerous (256+) users at any given time. The rate at which Hammerhead 2 attempts to pound your site is fully configurable, there are numerous other options for trying to create problems with a web site (so you can fix them). It can be used to test the behaviour of the port under load, or the ability of the port to service a set of requests. Warning: Hammerhead can destroy a web site very quickly (and cost you lots of money if you pay for traffic you generate). It should only be used to generate heavy loads on local web sites for testing purposes.

http://hammerhead.sourceforge.net/