[[https://launchpad.net/loggerhead|Loggerhead]] is the code that runs the 'browse code' pages on Launchpad.

It has four views: 

 * a change log view that lists revisions,
 * a revision view that shows the changes between two revision,
 * a file listing that shows the directories and files in a directory, and
 * an annotate view that shows the contents of a file and which revision last touched each page.