Various Python modules of GIS interest (those not included elsewhere, like in a framework), and other random modules. These may be available elsewhere, but usually they are built for the python.org Python, and I prefer to stick with the system Python. Also, I link to my frameworks where possible. Downloads are for modules with binary components. Any others can be easily installed from source, no Xcode tools needed.
All are built for the system Python in OS X Lion and Mt Lion (Python 2.7) and Snow Leopard (Python 2.6). I'm sorry, but I don't support earlier versions of the system or other versions of Python, or other installations of Python.
Also included on the GDAL Framework disk image, though it may not be up to date.
Python Imaging Library
Spatial Analysis Library
Requires: NumPy, SciPy
Source & Documentation: pysal.org
This one has no binary components, so you can install from source without needing Xcode. Download the source, and unzip it. In a Terminal, cd to the source and:
sudo python setup.py install