Audyssey MultEQ has been around for a couple of years now. It is being more popular in receivers such as Denon, Onkyo and NAD. There is also a standalone unit, but it is rather expensive.
Here is a thread from a couple of years ago where I took measurements with REW to show that Audyssey (in my former Denon 3806 receiver) was doing with my response.
Here's my most recent graph with the latest version of Audyssey in my NAD T785 receiver.
I have some other graphs posted somewhere in I think the REW Forum where I tried it again with other Denon receivers and I could not get it to do anything, but I cannot find those at the moment.