The current development version of CGManager can be cloned from Github with:
git clone git://github.com/lxc/cgmanager
Source tarballs from the various stable releases are also available in the downloads section.
Patches sent upstream for review must be based on the current git tree
and not on stable releases, unless the bug only affects a stable release.
You may contribute to CGManager either by sending a patch or patchset directly on the cgmanager-devel mailing-list.