Note: this post is from 2007, outbound links may be broken.
[CodeOperator] releases URSonic IIR-Reverb
From the product page:
It is very colorfull and has a high density. IIR-Reverb comes with a 5 Band full Parametric Graphical based Equaliser that you can edit the reverb tail in every frequency you like. You can form every space you need, especially Drum Rooms.
Since IIR-Reverb is made with Pluggo-MAX/MSP from cycling74, you will need the Pluggo-Runtime (version 3.6.x or higher) to use IIR-Reverb.
IIR-Reverb can be purchased for $199.