I wish you good luck with your business. I offer a free NLP API as a web service (kbsportal.com, written from scratch in Clojure) that unfortunately gets little use.
There are very good open source NLP libraries like Stanford NLP, OpenNLP, and NLTK. I think the opportunity for business might be in building custom language models for customers based whatever domains they deal with (e.g., medicine, housing, real estate, etc.)
There are very good open source NLP libraries like Stanford NLP, OpenNLP, and NLTK. I think the opportunity for business might be in building custom language models for customers based whatever domains they deal with (e.g., medicine, housing, real estate, etc.)