It is my favorite radio receiver for my RTL2832U / USB Dongle.Gqrx is an experimental software defined radio receiver implemented using
GNU Radio and the Qt GUI toolkit.
Gqrx can operate as a traditional AM/FM/SSB receiver with audio output or
as an FFT-only instrument.
I have compared between: multimode, SDR#, linrad and gqrx.
It is the best because it is easy to operate and consumes little resources.
For the RTL2832U / USB Dongle it need the libusbx library instead of libusb
to prevent error message like this: "sdr_read_async returned with -5"
gnuradio 3.7.3 and depends
osmocom-sdr-multimode with libusbx