You can download the package from Python package index,
http://pypi.python.org/pypi/zwiki-zeta/0.9beta
Browse the source code at,
http://dev.discoverzeta.com/p/ZWiki/s/1/browse#zwiki
Note that you will have to register yourself with
http://dev.discoverzeta.com to be able to browse the source code.
To get started, follow the README file,
http://dev.discoverzeta.com/p/zwiki/wiki/README
Cheers,
--
Pratap.
Developer, Zeta project collaboration, http://discoverzeta.com