Open-ended customer feedback analysis is not a stand-alone application because it needs to be fed with text. And that text comes from outside, from another application or platform. Feedback analysis is a feature that enhances the functionality of an application.
Most CEM, CRM, BI and Contact Center platform vendors have the necessary competencies and skills to solve their core domain problem with their own software development team. Additional functionality–embedded analytics services like advanced text analysis or image recognition–can and should be provided by specialized 3rd party software vendors.