The Bazaarvoice software development kit (SDK) for iOS is an iOS static library that provides an easy way to generate REST calls to the Bazaarvoice Conversations API. Using this SDK, mobile developers can quickly integrate Bazaarvoice content into their native iOS apps for iPhone and iPad on iOS 5 or later. Developers can display content as well as submit content such as ratings & reviews, questions & answers, and campaigns, including text and photos. Included reference apps and a Quick Start Guide allow developers to integrate Bazaarvoice content quickly, with little overhead.

The Firebase iOS framework for adding realtime data synchronization to your app.

A collection of source from different Google projects that may be of use to developers working other iOS or OS X projects.

Request authentication from users through passphrases or biometrics.

Render advanced 3D graphics and perform data-parallel computations. Get fine-grained access to the GPU while minimizing CPU overhead. The Metal Framework provides extremely low-overhead access to the GPU, enabling incredibly high performance for your sophisticated graphics rendering and computational tasks. Metal eliminates many performance bottlenecks—such as costly state validation—that are found in traditional graphics APIs. Metal moves all expensive state translation and compilation operations out of the critical path of your most performance sensitive rendering code. It provides precompiled shaders, state objects, and explicit command scheduling to ensure that your application achieves the highest possible performance and efficiency. Graphics, compute, and blit commands can be used together seamlessly and efficiently. Metal is specifically designed to exploit modern architectural considerations, such as multiprocessing and shared memory, to make it easy to parallelize the creation of GPU commands.

Nanopb - protocol buffers with small code size

StoreKit enables users to embed a store in their app. It also process financial transactions associated with the purchase of content and services.

The UserNotifications framework (UserNotifications.framework) supports the delivery and handling of local and remote notifications. You use the classes of this framework to schedule the delivery of local notifications based on specific conditions, such as time or location. Apps and extensions also use this framework to receive and potentially modify local and remote notifications when they are delivered to the user’s device.

The Ad Support framework provides apps with access to an identifier that can be used only for serving advertisements, as well as a flag which indicates whether a user has limited ad tracking. Accessing the advertising identifier requires apps to read and honor the opt-out flag.

AFNetworking is a networking library for iOS and Mac OS X. It's built on top of the Foundation URL Loading System, extending the powerful high-level networking abstractions built into Cocoa. It has a modular architecture with well-designed, feature-rich APIs that are a joy to use.