The API.AI .NET SDK by API.AI aims to simplify API integration features of natural language processing into new applications. Resources include a programming interface to make text and voice requests to the API.AI. Additional resources could be useful to add usages to a module, add field to a class, and initialize object with Keys. See how JSON.NET helped with parsing implementation at http://www.newtonsoft.com/json
Here is an interview with Brandon Wirtz, CTO of the very exciting text mining API startup Stremor.com. We have covered Stremor here before. Liquid Helium API is the core of all Stremor's products and it extracts information about sentence and paragraph structure, word usage, parts of speech, grammar, writing style, punctuation, and author bias. Stremor also has a new kind of search engine called Samuru based on it's language APIs.
BigML, a leading machine learning and predictive modeling platform provider, has just announced the 2014 BigML Spring Release which includes new features and improvements including cluster analysis, additional filter options, segment-based dataset creation in models, new BigMLer command line tool features, and much more.