Desktop app that helps you craft Gatling load-testing simulations
...The output is a ready-to-run Gatling project (Java/Maven) that can be executed locally or uploaded to Gatling Enterprise to run at scale. Gatling Studio targets performance engineers and QA teams who want a low-code path from “record what a user does in the browser” to “run a realistic load test.”
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
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.
Distributed load testing framework - Java, Jython, or Clojure scripts.
The Grinder is a load testing framework that makes it easy to run a distributed test using many load injector machines. Test scripts are written in Jython, and can call out to arbitrary Javacode, providing support for testing a large range of network protocols.
The Grinder comes with a mature plug-in for testing HTTP services, HTTP scripts can be recorded easily from a browser session.