FlightGear: http://www.flightgear.org/
Mesa 3-D 库: http://www.mesa3d.org/
搜索和救援: http://wolfpack.twu.net/SearchAndRescue/
WINE 总部: http://www.winehq.com/
XPilot 网站: http://www.xpilot.org/
XScreenSaver 网站: http://www.jwz.org/xscreensaver/
XView 工具包: http://step.polymtl.ca/~coyote/xview_main.html