I did a google search and came up with these free ones.
Note that they might contain pup's so use caution.
I don't know if they will do what you want.

https://www.youtube.com/watch?v=ujMhxPJnJCw#t=22

http://www.nchsoftware.com/chart/

http://download.cnet.com/Diagram-Des...-10429024.html

http://www.gliffy.com/