DuckDuckGo Zero-click Info includes topic summaries, categories, disambiguation, official sites, !bang redirects, definitions and more. You can use this API for many things, e.g. define people, places, things, words and concepts; provides direct links to other services (via !bang syntax); list related topics; and gives official sites when available.
Sentiment analysis, stemming and lemmatization, part-of-speech tagging and chunking, phrase extraction and named entity recognition.
Viralheat sentiment is free API and allows users to submit short chunks of text for sentiment scoring.
The multilingual sentiment analysis API (with exceptional accuracy, 83.4% as opposed to industry standard of 65.4%, and available in Mandarin) from classifies social media texts as positive or negative, with a free daily allowance to get you started. The system uses advanced statistical models (machine learning & NLP) trained on social data, meaning the detection can handle slang, common misspellings, emoticons, hashtags, etc. You can use this API for free. If you require more flexibility and larger scale you can move up to a paid-for plan. Please note: The free plan offers 500 statuses classified per day - any use over this will be charged for. If you are using more than 500 statuses per day it is more cost effective to upgrade to one of the low cost, paid-for plans or contact us direct for an Enterprise offering.
Jeannie (Voice Actions) is a virtual assistant with over two Million downloads, now also available via API. The objective of this service is to provide you and your robot with the smartest answer to any natural language question, just like Siri. This service provides an interface to the standard functions that users demand of modern voice assistants. For example chatting, looking up information, creating messages and much much more. It also provides useful metadata such as sentence analysis and entity extraction that goes beyond simple chatting and voice commands. Over 2 million users have already been in contact with this API: http://www.voice-actions.com/ Examples: https://weannie.pannous.com/api?input=hi&login=test-user https://ask.pannous.com/?input=hi Complete documentation: https://docs.google.com/document/d/1dVG_B5Sc2x-fi1pN6iJJjfF1bJY6KEFzUqjOb8NsntI/edit