Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality.

Samba is an implementation of the SMB/CIFS protocol for Unix systems, providing support for cross-platform file sharing with Microsoft Windows, OS X, and other Unix systems. Samba can also function as a domain controller or member server in Active Directory or NT4-style domains.

Bustle is a tool to chart and provide timing information of D-Bus calls for profiling and debugging purposes. It is intended to replace reading the cryptic output of dbus-monitor.

Kismet is an 802.11 layer-2 wireless network detector, sniffer, and intrusion detection system. It will work with any wireless card that supports raw monitoring (rfmon) mode, and can sniff 802.11a/b/g/n traffic.

A collection of GUI based ALSA utilities for specific sound hardware:

pyNeighborhood is GTK2 Python rewrite of a well-known gtk1 tool "LinNeighborhood". It features group browser, favourite hosts manager and mounts monitor.