vPerformer allows you to measure the performance & scalability of your web apps
vPerformer is a performance and load testing product that can be used assess the performance and scalability of your web apps. vPerformer allows you to assess how your web application responds when it is concurrently accessed by a large number of users. You can measure the performance characteristics of your application by recording and replaying automated scripts that simulate a large number of concurrent virtual users.
vPerformer 1.0 details 
