I have seen some of visualizations of repositories of softwares. I saw Gource via a post on FriendFeed, its really simple to compile it and easy to use. You only need to give it the root directory of a repo if its a Hg or Git.

The followings are some of mine

1   Commands

Just for the record:

gource -640x360 --start-position 0.3 --stop-position 0.7 -s 1 --file-filter "/((Bash|ChromeExtension|GoogleAppEngine|GoogleGadget|JavaScript|Miscellaneous|Python|lastweet|twitter-python-client|twitter-tracker)/.*|Blogger/\w+\.\w+)" --output-ppm-stream - --output-framerate 30 ~/p/yjl | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - brps1.mp4
gource -640x360 --stop-at-end -s 1 --output-ppm-stream - --output-framerate 30 ~/p/brps | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - brps2.mp4
gource -640x360 --stop-at-end -s 1 --output-ppm-stream - --output-framerate 30 ~/p/lso | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - lso.mp4
gource -640x360 --stop-at-end -s 1 --file-filter "/Blogger/brps/.*" --output-ppm-stream - --output-framerate 30 ~/p/yjl | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - yjl.mp4
gource -640x360 --stop-at-end -s 1 --output-ppm-stream - --output-framerate 30 ~/p/twimonial | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - twimonial.mp4
gource -640x360 --stop-at-end -s 1 --output-ppm-stream - --output-framerate 30 ~/p/lilbtn | ffmpeg -y -b 3000K -r 30 -f image2pipe -vcodec ppm -i - lilbtn.mp4