Get it

csync and pam_csync

You can download it here.

Packages

Packages for openSUSE and Fedora based distributions can be found here.

Ubuntu/Debian packages can be downloaded here.

Git it

Example checkout command for the main git repo:

git clone git://git.csync.org/projects/csync.git

Browse the source code

Example checkout command for the pam_csync git repo:

git clone git://git.csync.org/projects/pam_csync.git

To start with git take a look at the Git Community Book.