Orx: Portable Game Engine
An isometric arcade-style game of skill, puzzles and exploration
Build Cross-platform Applications
IRB is a game creation toolkit
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Multimedia asset management and manipulator for Étoilé
2D Game Engine, based on OpenGL and focused on Isometric Games
Extremely simple joystick rumble / vibration library
Game development toolkit
Pear3DEngine is a modern and modular 3D development framework
Phobos editor is a generic resource editing system.
C++ Game programming Framework
A cross-platform OpenGL based lightweight scenegraph library
The Objective-C Interactive Simulation Abstraction Layer