Friture - Friture is a program designed to analyze audio input in real-time.
Visual Analyser - A powerful software implementing a Spectrum Analyzer, Oscilloscope, Frequency meter, Distorsiometer, Volt meter and more... plus complete D/A conversion, ZRLC, Impedance meter
xoscope - Xoscope uses the input of your Sound Card, EsounD and/or a ProbeScope/osziFOX and Bitscope-Hardware.
TrueRTA - Audio analyzer application for testing and evaluating audio systems using a Windows PC with basic...
Zelscope - Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and...
Spek - Spek helps to analyse your audio files by showing their spectrogram.