MAObjCRuntime is an ObjC wrapper around the Objective-C runtime APIs. If that's confusing, it provides a nice object-oriented interface around (some of) the C functions in /usr/include/objc.

URLCache subclass with on-disk cache support on iPhone/iPad

BuildKit is a collection of configurations, scripts and Xcode project templates organization to manage creating, using, building and sharing static libraries and iOS applications. BuildKit leverages multi-layered build settings in Xcode.

Galaxy Engine is a complete game development package for Mac, iPhone, and iPad. It is programmed in Cocoa and uses the OpenGL, OpenGL ES, and OpenAL libraries to give you a powerful core with direct access to iPhone SDK features such as Game Center. Galaxy Engine is designed with indie developers in mind. Which means that it is designed to be as efficient and flexible as possible. It also is one of the only Open Source game engines to include critical tools for game development such as: Level Editor, Terrain Editor, Model Viewer, Particle Editor, and Shader IDE. It also includes features such as: vertex animation, advanced lighting, dynamic shadows, vertex and pixel shaders, normal mapping, parallax mapping, and massive outdoor environments.

OpenSource analog of UISegmentedControl. Allows you to customize segment view.

S4LuceneLib is an iOS native version of Apache's Lucene project. The S4LuceneLib directory contains an XCode project that will build an iOS static library for inclusion in your project. The iPhoneLuceneSearch directory contains a sample iPhone application using the library - it is intended for testing purposes at this point.