TX Library is a tiny graphics library for Win32 written in C++.
Orx: Data-Driven Game Engine
Build Cross-platform Applications
IRB is a game creation toolkit
Toolkit for the easy prototyping of hybrid games for Tabletop Devices
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
Investigo - DX9 Performance and Debugging Toolkit
A cross-platform OpenGL based lightweight scenegraph library
A DirectX based graphics/physics engine