While trying this extension on several big projects, I found the results to be quite interesting and decided to put up this gallery. I'm using the following command line:
hg activity --splitauthors --maxauthors 6
on mercurial clones of those projects and display the result here. Yes, most of the time the mercurial repository is just a mirror and not the official source control used. This explains that for some of them, not the whole history is displayed.
warning : this is just for fun (expression copyright Linus Torvalds), I'm perfectly aware that the number of commits is a very bad indicator for development.
Position your mouse on a graph, and the tooltip will tell you which project this is.