Didn't it become, or at least become part of, Freeverb, which is now at http://freeverb3.sourceforge.net/ ?
Incidentally, the yafr2 patch in the /examples folder is 'in the style of' Griesinger's plate algorithm...
Hey Hans! There has not been development of my VSTs in a long while. And to be clear, I am NOT associated with freeverb. But the algorithm in [gverb~] is the same as the VST plug-in, but without all the controls. It basically initializes as the default preset and lets you change the reverb time. Sorry if that won't work for your current application.