Gource is a famous version control visualization tool, supports git, svn, hg, bzr and cvs2cl, I tried to use gource to visualize the CDNJS development history, and here are the videos I uploaded to youtube.
CDNJS main repository:
(https://github.com/cdnjs/cdnjs)
https://www.youtube.com/watch?v=ehwK-KM4uYQ
CDNJS new-website repository:
(https://github.com/cdnjs/new-website)
https://www.youtube.com/watch?v=GLH7Ovzi5z8
