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
Microsoft's Cognitive Services portfolio includes over 20 APIs, which remain in different stages of development. Yesterday, Microsoft announced three more Cognitive Services APIs for general availability. The Face API, Computer Vision API, and Content Moderator API are now GA.
Twenty Two APIs have been added to the ProgrammableWeb directory in categories including Recognition, Engagement, Editing, and Games. Highlights include the Skype Bot REST API for deploying Skype messaging bots and the Microsoft Speaker Recognition API which can identify users by voice.