How to make a stickman movie

http://www.youtube.com/watch?v=USNImOiYAck

List of animation, visualization tools for Ubuntu
http://ubuntuforums.org/showthread.php?t=293798
Synfig
http://www.youtube.com/watch?v=WUxn9jqFJrg
http://www.youtube.com/watch?v=4OTZcY2Uj1k
http://www.youtube.com/watch?v=r-FSDouTUkk