Gqrx is a software defined radio receiver powered by GNU Radio and the Qt GUI toolkit. It can process I/Q data from many types of input devices, including Funcube Dongle Pro/Pro+, rtl-sdr, HackRF, and Universal Software Radio Peripheral (USRP) devices.
QPlot - 2d plotting tool based on Qwt project (http://qwt.sf.net).
QPlot reads mission INI-files and draw 2-d graphics. Data may read from binary and text files both. Plot area may have 2-4 axis.
QPlot may used as Gnuplot alternative.
QPlot may used to descovery Qwt as example programm.