Boson Audio Editor - Boson is an audio editor/recorder for Mac OS X.
Friture - Friture is a program designed to analyze audio input in real-time.
TAPESTREA - TAPESTREA is a unified framework for interactively analyzing, transforming, and synthesizing complex sounds.
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
Colibri Lossless - A native audio player for macOS built from scratch using the award-winning BASS audio engine.
xoscope - Xoscope uses the input of your Sound Card, EsounD and/or a ProbeScope/osziFOX and Bitscope-Hardware.