We use Apache Subversion for version control. You can browse our repository in your web browser.
For further information see the Apache Source Code Repository page.
This will get you everything, including the language files:
svn co https://svn.apache.org/repos/asf/incubator/ooo/trunk ooo
Including SVN overhead, this requires approximately 4 GB of storage.
We have an instance of Altassian FishEye for source browsing, searching, reporting and visualization.
See the OpenOffice.org Building Guide (somewhat out of date) for an overview on building.
See AOO 3.4 Unofficial Developer Snapshots for additional information on building.
Our SVN tree is read by the Ohloh tracker to generate some various statistics. Note that the migration from the legacy Mercurial repository to SVN at Apache has caused pre-existing files to be double-counted. But the contribution history should be intact.