Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

spaCy - spaCy is a library for advanced natural language processing in Python and Cython.

Synonymful - Improve your vocabulary and communicate like a pro.

Google Cloud Natural Language API - Natural language API using Google machine learning

Fluent - Fluent is a people-based marketing platform that uses real-time, one-to-one interaction to create custom audiences and serve personalized ads that drive performance at scale.

monkeylearn - Text Mining Made Easy. Extract and classify information from text. Integrate with your App within minutes.