Get it

csync and pam_csync

You can download it here.

Git it

Example checkout command for the main git repo:

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

Browse the source code

Example checkout command for the pam_csync git repo:

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

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