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The core of Green Valley is an open source script-based software framework .
It fits specially well in game engines but can be used in other programs as well.
The extension of Green Valley provide some useful libraries for building a game.
ChessXtra is a script xtra for Macromedia Director that uses GnuChess as a library to play chess. We (www.theblip.com) used it previously to power our chess-playing bot, and figured the community at large could use/improve on what we've got.