Anyone know of a good Impulse-running plug-in for Mac?

Rex Rocker

Call me Hugo!
Dec 21, 2007
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... that's free? (preferably)

I remember someone posted one a while back, but I don't think I saved the file... I'd be more than thankful if someone points me into one... THANKS! :)
 
I will say that having tried some of the programs people are suggesting, I've had the best luck with Altiverb, which is expensive but fantastic sounding.