Take the chess graphism, and use it with a chess engine.
C++ Framework for slot machine games
Kinect based controller.
3D Interactive sandbox environment
A 3D, fully concurrent game engine
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A cross-platform game framework based on OpenGL and GObject.
A multiplatform game engine for interactive fiction experiences
A retro style video game engine for RPGs and adventure games.
2D Game Engine, based on OpenGL and focused on Isometric Games
Extremely simple joystick rumble / vibration library
Scriptable frontend for media applications.
A graphics engine + toolkit.
Sprite Font Creator
Create your own animated characters for games with ease!
Convert Ren'Py visual novels into a format your ebook-reader knows
Little game background framework in java.
Pear3DEngine is a modern and modular 3D development framework