The installer for windows is here.
There are x86 packages for Debian 5.0
and for Ubuntu 9.04
Some packages for openSuse and other distributions are in the repository of QtDesktop project
Sources
The tarball is here.
SVN is available at https://cuberok.googlecode.com/svn. For details see http://code.google.com/p/cuberok/source/checkout
Test builds
Test builds are in the other page