PiSi is a modern package manager for UNIX systems. It has been designed to meet the requirements of the Pardus Linux distribution, and it is not derived from any other package manager. It is efficient and small. Package sources are written in XML and Python. Fast database access is implemented with Berkeley DB. It integrates both low-level and high-level package operations. Sources can be maintained easily through a version control system as original sources do not have to be copied. It uses a framework approach to build applications and tools upon. It has both a comprehensive CLI and a user-friendly Qt-based GUI.
Scribbler is a quick, easy, minimalistic diary script written in Python. When called without arguments, it allows you to edit today's diary entry. When the -b option is used, it allows you to browse old diary entries. Scribbler uses vim and lynx by default, but you can easily change these settings to your favorite editor/browser.
SPIN_py is a Python module that wraps the SP SGML parser. It does not follow SAX, nor DSSL, but it performs a similar task. It has code to build (and pretty-print) trees from C++ or from Python, and it has an interesting object model, with virtual C++ objects, based on PyObject_HEAD.