Guided Tutorial Hardware Considerations - GNU Radio
Signal Hound modules let spectrum analyzers serve as I/Q sources within open-source GNU radio apps
Low cost SDR spectrum analyzer and analog radio receiver using GNU radio, raspberry Pi2 and SDR-RTL dongle | Semantic Scholar
GitHub - xmikos/qspectrumanalyzer: Spectrum analyzer for multiple SDR platforms (PyQtGraph based GUI for soapy_power, hackrf_sweep, rtl_power, rx_power and other backends)