Alternative to VS Ultimate for automated load testing

Does anyone know of a load testing framework for .NET as an alternative to VS Ultimate? I'm looking for something similar to JUnitPerf which allows you to run JUnit tests concurrently for multiple simulated users, see here.

I've looked around a lot and so far come up with not much other than:

• PNunit: seems to be more for speeding up testing by running tests in parallel and testing syncronisation issues.


• mbunit: this has the ThreadedRepeat attribute which looks promising but the library hasn't been updated for about 3 years


• Blazemeter: a service that'll hammer your service/site/etc. but not really what I'm after, I'd like to have load tests integrated with unit tests

Anyone know of others and/or used mbunit successfully in this way?