I'm not a huge contributor on these forums, but I do read a lot. Anyhow, I have "completed" a couple things I've been working on in the last couple weeks, and thought I would share.
https://bitbucket.org/jgrigonis/mortgagecalculator
A simple mortgage calculator written in python using tkinter that lets you calculate any of 4 variables (principal, monthly payment, interest rate, number of payments) based on the value of the other 3. It includes a GUI version, and a command line interface, and can be built into MacOS and Windows executables using py2app or py2exe.
https://bitbucket.org/jgrigonis/mathfacts
A simple game to test beginners with math questions.
The code in mathfacts is totally uncommented, but I plan to do that, and some refactoring next.
They are both written in python and use tkinter. Once I finish refactoring the math game, it's time to learn a better windowing framework, leaning towards qt.
Let me know what you think of my toys. There are direct downloads of the executables for mac and windows, but they are much bigger than the source.