Gource is a software version control visualization tool, and it can create very cool videos showing the development over time.

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.

Below you can see the XOOPS 2.6.0 development on GitHub : one year in 45 seconds