LoadUI - Load Testing Tool

loadUI deliver a visual, drag-and-drop interface which allows you to create, configure and redistribute your Load Tests interactively and in real-time. You can distribute your Load Tests across any number of loadUI Agents on local or remote machines, allowing you to simulate high volume and real-world load with incredible efficiency. It supprots wide range of protocols and technologies from HTTP(S), HTML, SOAP/WSDL and REST to AMF, JDBC, JMS and POX.

Sourceforge: http://sourceforge.net/projects/loadui/