For Unix: xanim is one of
the most versatile viewers. It can be used to view all the file formats
used here.
For Windows: Xing
MpegPlay for mpeg videos. Standard quicktime and avi players generally
come installed in windows and files can be played using the Windows Mediaplayer.
Interactive Human Motion Composition:
An interactive GUI and details to compose human motion queries for search in video databases can be obtained here.