I built GospelParallels using Python. The ActiveState
Python distribution is a very complete (and free)
distribution on Python. I like the completeness
of this distribution.
You will need to download wxPython (which in turn
has wxWindows contained therein). wxWindows and
the wxPython wrapper are a great UI for Python.
You can change the UI by hand, but I used Boa Constructor
as the RAD building tool to create the UI.