Grinder is load testing tool for Java programming language available under the BSD-style open source license. It aims to simplify the running of a distributed testing using load injector machines. It has the capability to do load testing, capability testing, functional testing, and stress testing. It has minimum system resource requirements, and, along with that, it manages its own thread in the test context, which can be split over the process if required.

The following are the features of Grinder:

• An easy-to-use Java Swing-based user interface.
• It can be used for load testing of anything that has Java API. It can be used for Web servers, web services based on SOAP and REST API, and application servers.
• The Jython and Clojure languages support writing flexible dynamic test scripts.
• It manages client connections as well as cookies.