It is the open-source project under the terms of Apache License 2.0.
It allows you to enjoy all the benefits of JsTestDriver right from the comfort of your IDE. This includes the following features:
Please visit Installation page.
Please visit Getting Started page.
Please visit Roadmap page.
If you've found a bug, a glitch, anything that doesn't work well, or as you think it should, you're welcome to WebStorm/PhpStorm project issue tracker.
Please select "Plugin: JsTestDriver" subsystem when creating a new issue.
Please don't file an issue to http://code.google.com/p/js-test-driver/issues/list?q=label:IntelliJ. Though those bugs are on queue, but it's an old way.
If you are considering participation in the development of the plugin, or just going to build it yourself, please visit Development page.