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.
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
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.
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.