The Core Location framework lets you determine the current location or heading associated with a device. The framework uses the available hardware to determine the user’s position and heading. You use the classes and protocols in this framework to configure and schedule the delivery of location and heading events. You can also use it to define geographic regions and monitor when the user crosses the boundaries of those regions. In iOS, you can also define a region around a Bluetooth beacon.

The Message UI framework provides specialized view controllers for presenting standard composition interfaces for email and SMS (Short Messaging Service) text messages. Use these interfaces to add message delivery capabilities without requiring the user to leave your app.

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

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.

A Airbrake Notifier for iOS.

A similar control to the pull down to refresh control created by atebits in Tweetie 2.

A Cocoa / Objective-C wrapper around SQLite.

A replacement for Cocoa's NSXML cluster of classes. Based on libxml. Works on iOS.

A delightful iOS statistics and push notifications framework.

A humane JSON Objective-C un-framework. (TouchJSON has been deprecated - see README).