This Demo makes use of Adobe Flash based FLARToolkit for marker tracking and X3DOM for 3D rendering.
Please print out this marker: x3dom-marker.pdf or
x3dom-marker.png
and point it to the camera.
The files of the X3Dom/AR application are avaiale here: demo-sources.zip.
The sources of the FLARToolkit based tracking are available here: flash-sources.zip
Note FLARToolkit is under GPL license.