ValhallaRoom has just been released for OSX, in the most popular plugin flavors – 32 and 64-bit Audio Units, 32-bit VST, and RTAS. The price is $50 US. You can demo/purchase the plugin at
Special thanks go out to my lovely wife, Kristin, for her design work on the GUI, and especially for her amazing new website design. You should go to http://www.valhalladsp.com and bathe in all of its majesty.