The entire source code for the ACPICA project is maintained under the Git
version control system, in a single repository.
The ACPICA Git source code repository can be browsed
here.
(http://git.moblin.org/cgit.cgi/acpica/)
The Git repository can be directly accessed via
git://git.moblin.org/acpica
For example,
git clone git://git.moblin.org/acpica