REALVIZ will make the MMTrack Plug-in for Autodesk 3DS Max and Maya available for free in conjunction with Siggraph 2006. The deal will be running from August 1, 2006 - August 1, 2007.

The MMTrack Plug-in allows you to matchmove (track) live footage with your animated scene.

You can download the MMTrack Plug-in for free from here.