This plug-in is a demonstration for python programmers of Gimp plug-ins. It displays almost all the built-in GUI widgets for parameters to plugins. It shows what a plug-in dialog can be using what is built into PyGimp. An alternative to using what is built in, is to use a Python GUI library such as pygtk.
Motivation: the documentation seems sparse for PyGimp GUI widgets. This is example code.
It does nothing to Gimp images, it's not for users, just for beginning programmers.