Wifty is a wiki built on Jifty, and it is what runs this site. Its code is freely available from the Jifty subversion repository via

svn co http://svn.jifty.org/svn/jifty.org/wifty/trunk

Wifty depends on the latest Jifty code, as well as the Login plugin that comes with it. After you have sucessfully tested and installed Jifty, install the Login plugin, found under jifty/plugins/login (no additional tests at the moment).

You may also browse the repository via the web.