The Python Checkbook Manager (aka PyCheckbook) is a personal finance manager that focuses on simplicity and portability. It will run on any platform that can run Python and Tkinter. It handles very simple checkbook register features.
ShareWatch - a client/server utility that keeps you up to date with share prices; uses free data (across multiple exchanges); provides a stock ticker and wxHTML window to display prices; chart downloading; platform independence. (Python/wxPython/SOAP)