"Gartner’s 2010 Magic Quadrant updates our evaluation of the top 25 vendors in this [BPMS] market, based on Gartner’s top four usage scenarios for BPMSs."

http://www.lombardisoftware.com/bpm-gartner-magic-quadrant.php

Intalio gets a mention as "visionary" (and uses Guvnor\Flow\jBPM)

Cheers,

Mike