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.

Core Foundation is a framework that provides fundamental software services useful to application services, application environments, and to applications themselves. Core Foundation also provides abstractions for common data types, facilitates internationalization with Unicode string storage, and offers a suite of utilities such as plug-in support, XML property lists, URL resource access, and preferences.

The Core Graphics framework is based on the Quartz advanced drawing engine. It provides low-level, lightweight 2D rendering with unmatched output fidelity. You use this framework to handle path-based drawing, transformations, color management, offscreen rendering, patterns, gradients and shadings, image data management, image creation, and image masking, as well as PDF document creation, display, and parsing.

The most powerful, yet lightest weight crash reporting solution for iOS and Android developers. | Crashlytics

A full suite of services created by the team that brought you Crashlytics. Fabric provides monetization, engagement and other uses for developers beyond crash reporting.

Magical Data Modelling Framework for JSON. Create rapidly powerful, atomic and smart data model classes.

This collection of documents provides the API reference for the Quartz Core framework, which supports image processing and video image manipulation.

A cross-platform mobile database designed specifically for mobile applications.