Gource is a software version control visualization tool.
Free • Open Source
Mac
Windows
Linux
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What is Gource?
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. Gource uses OpenGL and can also create videos.
Currently Gource includes built-in log generation support for Git, Mercurial and Bazaar and SVN. Gource can also parse logs produced by several third party tools for CVS repositories.
Not only is free and open source, but is also easy to use and install in any platform.
I will strongly recommend it as a reporting tool that allows customer see the work done.