Policyd v2 stable is the recommended release if you wish to use Policyd.
As this project is opensource and released under the GNU General Public License v2+, the sourcecode is freely available under that license.
There is a web interface to the repository to browse the sourcecode...
Information on checking out the sourcecode using Git can be found below.
GIT 1.7.3+ required.
GIT+SSH Read/Write for devels: