What is the best natural language question answering system?

What is the best natural language question answering system?

I want to develop a question answering system using NER technique. Can you help me by telling the best IDE to use in this case?

OpenEphyra – Ephyra … is a great Open Source Library. I extended my System using it. It has three NER Classifiers – Stanford NER Classifier, Pattern Based NER and List Based NER. For Questions and Answers, it has lots of Patterns.