Appcelerator Titanium – An open, extensible development environment for creating beautiful native apps across different mobile devices and OSs including iOS, Android, and BlackBerry, as well as hybrid and HTML5. It includes an open source SDK with over 5,000 device and mobile operating system APIs, Studio, a powerful Eclipse-based IDE, Alloy, an MVC framework and Cloud Services for a ready-to-use mobile backend.

ASIHTTPRequest is an easy to use wrapper around the CFNetwork API that makes some of the more tedious aspects of communicating with web servers easier. It is written in Objective-C and works in both Mac OS X and iPhone applications

CocoaAsyncSocket provides easy-to-use and powerful asynchronous socket libraries for macOS, iOS, and tvOS.

The Foundation framework provides a base layer of functionality for apps and frameworks, including data storage and persistence, text processing, date and time calculations, sorting and filtering, and networking. The classes, protocols, and data types defined by Foundation are used throughout the macOS, iOS, watchOS, and tvOS SDKs.

The Google Data APIs (GData) provide a simple protocol for reading and writing data on the web. Each of the following Google services provides a Google data API: Blogger Calendar Calendar Resource Contacts Content API for Shopping Documents List Email Audit Email Settings Google Analytics Google Apps Provisioning Google Webmaster Tools Picasa Web Albums Spreadsheets YouTube

The Media Player framework provides facilities for playing movie, music, audio podcast, and audio book files. This framework also gives your application access to the iPod library, letting you find and play audio-based media items synced from iTunes on the desktop. iPod library access is read-only.

PLDatabase provides a SQL database access library for Objective-C, focused on SQLite as an application database. The library supports both Mac OS X and iPhone development. Plausible Database is provided free of charge under the BSD license, and may be freely integrated with any application.

The UIKit framework (UIKit.framework) provides the crucial infrastructure needed to construct and manage iOS apps. This framework provides the window and view architecture needed to manage an app’s user interface, the event handling infrastructure needed to respond to user input, and the app model needed to drive the main run loop and interact with the system.