You can clone the public repo:
$ git clone https://github.com/blin/zabby.git
Or download tarball.
Once you have the source, you can install it into your site-packages with
$ python setup.py install
After installing zabby run it with
$ zabby -c /usr/local/lib/python2.6/dist-packages/zabby/examples/config.py
Config path will differ, based on your python version
Install build dependencies
$ aptitude install devscripts build-essential
Build
$ debuild
Install
$ dpkg -i ../zabby*.deb
Zabby will be started automatically by post-install script.