Amoeba role playing game engine - http://sourceforge.net/projects/amoebarpg/ A classic role playing game engine created completely in XUL, JS, XBL, and CSS. In the classic style of early Final Fantasy games. Development still in progress.
Gnusto - http://gnusto.mozdev.org Interpreter for adventure games, ancient and modern, in the Z-machine format.
Xulmine - http://xulmine.mozdev.org/ A project at mozdev.org that provides the famous Minesweeper-Game as extension for the Mozilla Browser.
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