I am a fan of both Apache and Python.  I just came across this interesting visualization about developers committing to the code base of open source projects.  From the site:

This visualization, called code_swarm, shows the history of commits in a software project. A commit happens when a developer makes changes to the code or documents and transfers them into the central project repository. Both developers and files are represented as moving elements. When a developer commits a file, it lights up and flies towards that developer. Files are colored according to their purpose, such as whether they are source code or a document. If files or developers have not been active for a while, they will fade away. A histogram at the bottom keeps a reminder of what has come before.

Python:

code_swarm – Python from Michael Ogawa on Vimeo.

Apache:

code_swarm – Apache from Michael Ogawa on Vimeo.