Conan - Connection analyzer for Qt is a C++ library that provides visual run-time introspection of QObject hierarchies, QObject inheritance, signal/slot connections, and signal emissions. Currently supports Qt 4.6.0 - Qt 4.7.2
mung is "monitor using ncurses, g++" and it's mostly an experiment for learning about ncurses. It runs in a terminal and displays temperature sensor info in real time on a color scale.
Displays performance counters on the Windows Taskbar. This is a replacement for CureInfo. It has support for xml configuration and is compatible with Vista (Taskbar Translucency, etc...).