Friture is a free and open source real-time audio analyzer for Linux, macOS and Windows. Using this you can analyze any audio file to understand the characteristics of that audio and behavior of that audio. Example you can analyze harmonics, feedback, reverberation, gain peaks, equalization from your audio data in separate widget. Some of the useful widgets are 2D Spectrogram widget, Spectrum widget, Octave Spectrum widget,Delay estimator, Level widget and Scope widget. It is released under the GPLv3+ license.