The Valby Grapples can be mounted onto Compact Excavators by means of a rigid-mount quick-hitch.  Below are some photos of a John Deere Excavator with a Valby SG52HD Stone Grapple.  This is a stone/scrap grab, which can also be used in light-duty demolition.  Click here for specs on the grapple.  The same hitch can also accomodate log grapples. 

A rigid mount rotator with continuous rotation is available for mini-excavator use. Click here for details