geximon is a Gtk2 reimplementation of eximon, an X monitor for the exim mail transport agent. It has all the features of the original (tracking the log, managing the mail queue, plotting, etc.) and more. It integrates with exiwhat (allowing you to manage exim processes), exigrep, and eximstats. It can utilize sudo, so that you don't need to run the program itself as the superuser. The interface is intuitive, compact, and easy to use.
guitest is a collection of helpers for unit-testing GUI applications written in Python. Support for pyGTK is most mature, and support for other toolkits is in progress. The library allows testing of modal dialogs and recursive main loop invocations while preventing the windows from being shown during test runs. Arbitrary classes and methods can be overridden, or call loggers attached to them.