SDRangel is an excellent open source signal analyser and general-purpose transmitter/receiver application, with support for numerous hardware platforms and popular modulation types, not to mention plenty of controls, spectrum visualisation options, and support for plug-ins.
In this latest video, I give a quick demo of SDRangel being used with a pre-production LimeSDR-Mini v1.0 board and a small antenna that came with a DVB tuner dongle, using these to receive broadcast FM radio stations.
With thanks to Edouard Griffiths for developing an eminently useful and easy to use application with great support for both LimeSDR Mini and its larger sibling, the LimeSDR!