» Amoeba role playing game engine    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.    http://sourceforge.net/projects/amoebarpg/

» Gnusto    Interpreter for adventure games, ancient and modern, in the Z-machine format.    http://gnusto.mozdev.org

» Xulmine    A project at mozdev.org that provides the famous Minesweeper-Game as extension for the Mozilla Browser.    http://xulmine.mozdev.org/