CrabEmu is a video game console emulator for Mac OS X, Sega Dreamcast, and various other *nix-like targets. Currently, development is focused upon the 8-bit consoles built by Sega, with support for the Sega Master System, Game Gear, SG-1000 and ColecoVision. Initial support for the NES is also available.
Objective-C embedded development package
mGSTEP is an implementation of NeXT's OPENSTEP specification which has evolved into Apple's Cocoa Objective-C frameworks. Designed for use in embedded devices it includes GUI frameworks that provide support for X11 and direct rendering to the Linux frame buffer.
Ethanon is a 2D game engine focused on the recent video cards for hardware acceleration and shader effects. The engine provides high-quality light an shadow effects with an easy visual interface and a simple and direct scripting system.
A fast, unobtrusive and modern cross-platform GUI toolkit. Agar fully exploits hardware acceleration where available, but also supports simple frame-buffer interfaces. Agar is stand-alone and easily portable to new platforms and graphics systems.
An action-packed multiplayer Macross (Robotech) game where the key focus is on the valkyrie fighters. Glory to the brave! (Robotech:Glory is also a beginner developers learning platform. Welcome!) IN PLANNING
The Objective-C Interactive Simulation Abstraction Layer
SimKit(because GameKit was taken) is designed to allow quick and easy cross platform abstraction away from platform dependant drawing and physics libraries. The APIs provide a generic way to make common calls for drawing, animating, and otherwise manipulating 3D entities, as well as shading and texture information.
The openDarwin is an open implementation of the Quartz graphical windowing engine mainly used in the MacOS X. It's main objective is to be source level compatible with it.