Loggerhead is a web viewer for projects in bazaar. It can be used to navigate a branch history, annotate files, view patches, perform searches, etc. It's heavily based on bazaar-webserve, which is itself based on hgweb for Mercurial. The primary difference is that loggerhead is built on top of TurboGears.
Loggerhead is released under the GPL license, and is written entirely in python 2.4.
In 2007, Michael Hudson picked up the project, improving it greatly. The launchpad site is the current hub of activity. I will try to keep this webpage up to date with news and releases, but the launchpad site is authoritative.
The current version is 1.2.1, released on 06 Mar 2008.