Core Audio is the digital audio infrastructure of iOS and OS X. It includes a set of software frameworks designed to handle the audio needs in your applications. Read this chapter to learn what you can do with Core Audio.

Game Center for Developers (GameKit). Games on iOS and OS X can take advantage of Game Center, Apple’s social gaming network. Game Center enables your users to track their best scores on a leaderboard, compare their achievements, invite friends to play a game, and start a multiplayer game through auto-matching.

With iAd, you can get your message out to the millions of people worldwide who use Apple products every day. Connect with users as they listen to music on iTunes Radio or while they use their favorite apps on our App Network. Find your audience using targeting tools built upon a foundation of registration and media consumption data that's exclusive to iAd. Bring your creative to life with exclusive features like Web GL with 3D motion graphics, Passbook and iTunes rewards. Invite your audience to watch your videos, explore your products, and even make purchases without taking them away from the app they were using.

A little sample showing how to access directly the datas of the camera in iOS

The Open Graphics Library (OpenGL) is used for visualizing 2D and 3D data. It is a multipurpose open-standard graphics library that supports applications for 2D and 3D digital content creation, mechanical and architectural design, virtual prototyping, flight simulation, video games, and more. You use OpenGL to configure a 3D graphics pipeline and submit data to it. Vertices are transformed and lit, assembled into primitives, and rasterized to create a 2D image. OpenGL is designed to translate function calls into graphics commands that can be sent to underlying graphics hardware. Because this underlying hardware is dedicated to processing graphics commands, OpenGL drawing is typically very fast.

Create the games you love with Unity Unity is a game development ecosystem: a powerful rendering engine fully integrated with a complete set of intuitive tools and rapid workflows to create interactive 3D and 2D content; easy multiplatform publishing; thousands of quality, ready-made assets in the Asset Store and a knowledge-sharing community. For independent developers and studios, Unity’s democratizing ecosystem smashes the time and cost barriers to creating uniquely beautiful games. They are using Unity to build a livelihood doing what they love: creating games that hook and delight players on any platform.