Tobii EyeX .NET SDK offers developers eye tracking features. Working in tandem with the Tobii hardware, the SDK allows developers to create natural human-computer interactions using a combination of eye-gaze and other user inputs. The EyeX SDK provides access to the EyeX Engine API so that an application can be gaze-enabled.
Affectiva's emotional measurement API has been around for a couple of years now. Affectiva has seen adoption by marketers, publishers, gaming companies, and chat services. However, Affectiva believes it can greatly expand the use case scenarios by offering its service at no charge to startups.
Amazon has introduced a Door Lock API that allows internet-connected lock providers to enable their locks to lock and eventually unlock doors with Amazon Alexa. The Door Lock API is part of Amazon’s Alexa Skills Kit, a collection of APIs and tools that developers can use to add skills to Alexa.