source code control for audit userspace tools

I brought this up on #audit but the conversation didn't go anywhere. It would be nice if there could be some form of source code control for the changes that occur between revisions of the userspace tools. Is development internally to RedHat done using any form of source code control? Or is the development more ad-hoq? Full public source code control would perhaps be beneficial in terms of fostering community development. Failing this, just having the diffs per discret change included in each release would be very helpful. Possible? Thanks Tony