Shakya is a Free Software (GPL) framework for easy and quickly building powerfull applications with Python and PyGTK. Besides, there is also an IDE, made with this same framework, thus users can graphically desing Shakya/PyGTK applications.
gSmile is an open-source emoticon manager, with which you can store your
emoticons in (nested) folders and find them quickly whenever you need one of them.
Written in Python, it uses the GTK+2 toolkit through the PyGTK wrapper.
The Open Conversion Toolkit converts files from one type to another
OCT ("Open Conversion Toolkit") is a set of programs for converting arbitrarily many files from their own file formats to others.
It includes a simple command-line program for converting, as well as a convenient wxWidgets user interface.