Gaming Engines
A Game Engine is the core software component of a video game. It typically handles rendering and other necessary technology, but might also handle additional tasks such as game AI, collision detection between game objects, etc. The most common element that a game engine provides is graphics rendering facilities (2D or 3D).
From : en.wikipedia.org/wiki/Game_engine
Open Gaming System (OGS)
The Open Gaming System (OGS) is a platform for developing open gaming software. It defines a application programming interface (API) and provides a free software implementation of this interface. OGS is designed to be portable, reusable, and flexible enough for use in any game world or campaign setting including medieval, modern, futuristic, gothic, eastern, and western, as well as the traditional fantasy setting.
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