spaCy - spaCy is a library for advanced natural language processing in Python and Cython.
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.
Amazon Comprehend - Discover insights and relationships in text
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
NLTK - NLTK is a platform for building Python programs to work with human language data.
ChatBot - Easy to use chatbot platform for business