Orx: Portable Game Engine
Orx is a portable, lightweight, plugin-based, data-driven and extremely easy to use 2D-oriented game engine. As orx is data driven, it allows users to create games with a small number of lines of code and reduces drastically the development time.
General purpose binary and multiway tree library for Max OS X Cocoa.
A date-time framework for Cocoa based on the Joda-Time Java library.
The Objective-C Game Library(ObjCGL) is a set of Objective-C classes that use SDL to provide a way for programmers to implement a basic set of components into their games quickly and easily.
A growing set of complete classes that ease iOS development. S4iOSLibraries provide an application framework for iOS development.
scl is Objective C library for macOS, iOS and GNUstep with custom set of ObjC classes and extentions of standard CF, Cocoa and Cocoa Toch classes, such as NSString
iOS Ports is a Collection of F/OSS libraries which have been ported to the iPhoneOS/iOS platform.
iSDGE is meant to be a free next generation 3D game engine for mobile devices supporting OpenGL ES 2.0. It is very easy to use, extremely flexible and fast. iSDGE is mostly written in C++ and currently comes with an Objective-C binding for iOS.