Is there a rating agency that constantly rates ERP software?

A number of independent consulting firms have been providing white papers that document strengths and weakness of the leading software products both from technology and market perspectives. These include Gartner group, Yankee group, Meta group and AMS, to name a few leading consulting firms. Gartner group annual ERP market white paper is the most authoritative document describing the relative strengths of the leading edge ERP software products. This document gets updated once every quarter.