This is a great visualization of the commit history for Ruby on Rails.

   http://vimeo.com/2979844?pg=embed&sec=2979844

Particularly notice what happens in the Spring of 2008 when the 
development shifted from using Subversion to manage the source code 
repository to Git at Github.

To be fair the increase in the number of contributors is not quite as 
large as shown in the visualization because Subversion didn't include 
data about the author of the commit when the author is different than 
the committer.

The code_swarm visualization tool was written using the Processing 
language: http://processing.org/.

You can read about how the Rails code swarm visualization was made here:

   http://www.igvita.com/2009/01/27/ruby-swarms-visualizing-rails-git/



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