Version control
The version control system Subversion is used by all ASF projects to manage their source code and other resources.
The "trunk" is where the main development happens. From time-to-time "branches" are used for specific short-term development tasks and later merged to trunk.
Developers can browse the trunk via direct access or via the ViewVC web interface. Similarly branches can be browsed (go up one level).
For every change, a notification email is automatically sent to the svn@ mailing list. Subscribe to that list or search the archives to keep up-to-date with changes.
Developers can work with the most recent sources rather than a released version, follow the instructions to checkout your working copy.
See other best practice notes.