Open Source Load Testing Tools

Winrk is a modern high-performance HTTP benchmarking tool for Windows. Inspired by the popular wrk utility, Winrk provides similar capabilities but is fully compatible with the Windows platform, making it ideal for developers and testers who need to stress-test web servers without relying on Linux or WSL. Written in Rust, Winrk leverages native multithreading and asynchronous networking to generate a high number of requests per second with minimal overhead. It is easy to use, fast to deploy, and built with stability and precision in mind. Whether you're testing local services or public APIs, Winrk helps you analyze performance, latency, and throughput under load, right from the Windows command line. Source code: https://github.com/fomalhaut88/winrk

The SoapUI download has moved to https://www.soapui.org/downloads/soapui/source-forge.html With more than 9 million downloads SoapUI is the de-facto standard for REST and SOAP API functional, security and performance testing.

Web application load testing tool written in Java. Uses a central console to manage remote simulations allowing for a large number of virtual users. Can test fullblown web applications requiring cookies and complex querystring and formdata.

A Perl-based benchmarking and load testing suite, with backend written in C. Based on apachebench, but extended with much more functionality. Currently released on CPAN as HTTPD::Bench::ApacheBench.

VNC for use with the BrowserMob Selenium JavaScript Validator. This tool is made available for users of BrowserMob FREE Website Monitoring and Load Testing. The BrowserMob Local Validation Service can be downloaded from https://browsermob.com/tools.

Charge is an LDAP load testing program. It can be easily modified to test other protocols.

Dieseltest is an easy-to-use load testing tool for simulating hundreds or thousands of users on a website. It has a facility for recording scripts, playing them back, and showing the results in real time. Results can be exported for further analysis.

Metatest is an integration and load testing framework. It's designed to run different test engines, run tests in serial or parallel, retarget tests (e.g. test DEV, then test UAT), vary test load, support continuous integration, and more!

SeaToad is a library to aid in concurrency and load testing of .NET code. Intended for use by developers or automation testers. For example, it makes a good second hand if you're trying to reproduce a concurrency issue. You can very quickly generate load representing one or more portions of the suspect code, while manually performing other tasks. Or perhaps you're worried about the performance of a particular stored procedure with load from an external source. SeaToad can run the stored procedure and the external load for you to locate performance and concurrency bottlenecks.

SoaBox lets you create a virtual version of your SOA environment. Clients (WS-Webservices,RESTful, JMS, HTTP, FTP, Filesystem, POJOs/Custom Code), servers (HTTP/Endpoints) and data (XML, SOAP, CSV, etc). It's written in Java and runs with JBoss 5.x and 6.x