Open Gaming System

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Welcome to the Open Gaming System web site!

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.

OGS can be freely copied, modified, and distributed under the terms of the GNU General Public License (GPL).