Paul Rodwell assembled this animation from the various github repositories we've used throughout the Smallest Federated Wiki project.
YOUTUBE hh4VpfnKAkg Twenty-some Contributors Create Federated Wiki
In the summer of 2013 we set out to reorganize the project towards delivery of easily installed components. One repository became many. The most dramatic changes happen in the last few seconds of this movie.
Making
Software projects are displayed by Gource as an animated tree with the root directory of the project at its centre. Directories appear as branches with files as leaves. Developers can be seen working on the tree at the times they contributed to the project. code 
– Gource has moved to gource.io
Sometimes it may be interesting to show the history of multiple projects in the same Gource animation. For instance: development activity in sub modules used by a project, multiple projects worked on by the same developers / company, or maybe different forks of a project. wiki – Mashups with Gource