Gqrx

Gqrx supports many of the SDR hardware available, including Funcube Dongles, rtl-sdr, HackRF and USRP devices.

Includes AM, SSB, FM-N and FM-W (mono and stereo) demodulators, and Special FM mode for NOAA APT. Displays FFT plot and spectrum waterfall.

It is powered by GNU Radio and the Qt GUI toolkit.