nlp_compromise - NLP tool for understanding, changing & playing w/ english.
monkeylearn - Text Mining Made Easy. Extract and classify information from text. Integrate with your App within minutes.
JAICP - JAICP (Just AI Conversational Platform) is a full-fledged conversational platform: scalable, NLP-powered, and secured. Build chatbots, voice assistants, smart devices in the snap of a finger
Google Cloud Natural Language API - Natural language API using Google machine learning
Sentigrade - A sentiment analysis API for customer surveys
spaCy - spaCy is a library for advanced natural language processing in Python and Cython.