Appirater is a class that you can drop into any iPhone app (iOS 4.0 or later) that will help remind your users to review your app on the App Store.

Functional programming constructs for Objective-C collections (map, reduce, each, filter, inject) Objective-C collections are pretty fantastic: immutability by default, and lots of other very solid features. They can be, however, quite a pain to deal with, for two reasons: Verbosity. Operations on collections is something that needs to be done very often, and often multiple operations are chained together. A simple Clojure (/ (reduce + coll) (count coll))) (to average a collection) involves a loop and several lines of code in Objective-C. Object wrappers. I don't have an answer for this, yet. But it's super annoying and creates a lot of boilerplate code to have to wrap native values in NSValue or NSNumber. And of course, it doesn't work with everything, like a user-defined struct.

ATValidations is a data validation library for several programming languages.

A technology platform that helps mobile game developers find new users and monetize their games

CocoaLumberjack is a fast & simple, yet powerful & flexible logging framework for macOS, iOS, tvOS and watchOS.

In-App Purchases StoreKit for iOS devices.

Allow users to browse, edit, and save images, using slideshows and Core Image filters.The Quartz Composer API supports processing and rendering graphical data and allows developers to create custom patches for the Quartz Composer developer tool. ImageKit provides user interface support for browsing, editing, and saving images, showing slideshows, and browsing and previewing Core Image filters. PDFKit is a technology that allows applications to display and manipulate PDF documents.

RevMobSDK for showing ads, banners, more games link and many more.

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.