Shows pictures from Wikimedia.
python catloader.py [Some Category]
where the optional parameter [Some Category] is Cats by default and selects the category of pictures to show.
Python 3, Gtk 3.
I do not know why I wrote/like this program. It exists here, because it makes me smile :).
There was a similar program as an old demo for (CL)S.
If you are a language designer, this might be a nice benchmark to check for "realism" of your language.