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
The Moodstocks API provides image recognition services that developers can integrate into their mobile and web applications. The image recognition API allows developers to add reference images and define them--a process that in turn can be used when identifying objects in images.