Dusk is a free open source 2D GMUD/RPG coded in Java . It was created by Tom Weingarten back in year 2000. There are plenty of features in the old game so I built a demo game you can play and enjoy the nostalgia of the old game. You need JRE installed for the game to work. DuskZ is a upgraded/modernized fork of the old Dusk engine but unfortunately is in a broken development state.