BaseX is a very fast and light-weight, yet powerful XML database and XPath/XQuery processor, including support for the latest W3C Full Text and Update Recommendations. It supports large XML instances and offers a highly interactive front-end (basexgui). Apart from two local standalone modes, BaseX offers a client/server architecture.

jstest-gtk is a simple graphical joystick tester. It provides a list of attached joysticks, and for each one can display which buttons and axes are pressed, remap axes and buttons, and calibrate the device.

USBView is a small GTK+ application to show what the device tree of the USB bus looks like. It shows a graphical representation of the devices that are currently plugged in, showing the topology of the USB bus. It also displays information on each individual device on the bus.

qpdfview is a simple tabbed document viewer which uses the Poppler library for PDF rendering and CUPS for printing and provides a clear and simple Qt graphical user interface. Support for the DjVu and PostScript formats can be added via plugins.

configure-debian is a program which presents a list of packages which use Debconf, Debian's configuration management system.

GtkOrphan is a graphical tool which scans your Debian system, looking for orphaned libraries. It implements a GUI front-end to deborphan, but adds the package removal capability. A detailed documentation on the program can be found at: http://www.marzocca.net/linux/gtkorphan.html.