FET (free timetabling software) automatically schedules the timetable of a school, high school, or university.
Qucs is a circuit simulator with a graphical user
interface. It aims to support all kinds of
circuit simulation types, including DC, AC, S-parameter, and harmonic balance analysis.
MODELbuilder is a scientific application that provides a graphical way to derive models from empirical and simulation data. It's fit to do regression and regression analysis.
A C++ exception stack tracer.
A Websocket implementation in Qt.