The Code_Swarm video is an interesting visualization of the evolution of the work done on the Python programming language and the people involved, tracing its evolution from late 1990 to mid-2005.
The intro for the video says:
In 1991, Guido van Rossum released his Python scripting language to the public.
This video will take you through the history of the project, compressed into a fraction of the time.
You will see the names of developers fade in and out of prominence, while the files they work on swirl around them.
Red files are core code. Blue files are documents. Yellow files are modules. The histogram on the bottom tracks the size and time of commits. When a person makes a commit, their name stands out. The files they commit also stand out. Files grow in size every time they are committed. Files and people gradually fade when there is no activity.