WebLOAD is a commercial-grade load and stress testing tool that is sponsored by RadView. It can load-test any Internet application, including applications that use Web 2.0 and AJAX.
WebLOAD provides a comprehensive and robust environment for performance testing. This includes a full authoring environment for recording, editing and debugging test scripts, a highly efficient execution environment for defining load parameters (virtual users), running and monitoring the tests as well as reporting tools for analyzing and presenting test results.

WebLOAD is an Open Source product available for free download and use under the GNU Open Source GPL License.