Building

First, install the necessary dependencies:

Install py2app
Install rumps (This fork fixes a Mavericks bug in the mainline repo: https://github.com/tito/rumps)
Install pyqt (brew install pyqt)
Install pyobjc (pip install pyobjc)

Next, run

python setup.py py2app

Running

Simply open dist/tracker.app.