The Google VR Android SDK by Google helps users develop virtual reality Android applications for Daydream and Cardboard. It includes a simple API for creating apps inserted into Cardboard viewers and a more complex API for supporting Daydream-ready phones and the Daydream controller.
The AR iOS SDK by ARToolKit provides tools for programmers to use with the ARToolkit API to develop augmented reality applications. The SDK is offered as an archived file that can be open and unpacked at the location of your choice. The ARToolKit API offers an API with the aim to integrate camera, image, video, and detector features into an application.
The GameAnalytics Unity SDK by GameAnalytics allows developers to integrate the GameAnalytics API with their Unity projects. This SDK includes support for Windows, Mac, Linux, WebGL, iOS, tvOS, and Android.