NeoLoad

http://www.neotys.com/product/demo-neoload.html

http://en.wikipedia.org/wiki/NeoLoad

http://www.neotys.com/load-testing/how-it-works.html

http://bharath-marrivada.blogspot.com/2010/08/neoload-vs-loadrunner-ajax-click-script.html    (Go one to refer for diference b/w NeoLoad vs Load Runner)