I just stumbled across SpectraPLUS by Pioneer Hill Software. The PC based application seems to be in use by various industries.
spectrasc_main_small – screenshots

Note that there are (3) versions of the software and each one is available as a 30 day unlimited functional demo. – downloads

The websites technical articles reveals some of what the software is being used for, – technical articles

Typical Applications

Audio equipment testing
Vibration testing
Distortion measurements
Frequency Response tests
Room Acoustic measurements
Noise measurements and monitoring
Precision signal generation
Sound Power measurements
Musical instrument manufacturing and testing
Production testing
Underwater acoustics, pile driving noise levels
Rotating machinery analysis
Impact testing

Key Features

Real-time spectrum analysis of live input
Record, Playback and Post Process WAV files
Displays: Time Series, Spectrum, Spectrogram, 3-D Surface, Phase
Full Featured Dual Channel Signal Generator
High Resolution FFT Analysis up to 1,048,576 pts
Octave Analysis from 1/1 to 1/96 octave
Up to 24 bit precisionShenand
Digital Filtering, Distortion Analysis, Transfer Functions
Acoustic Tools: RT60, Equivalent Noise Level (Leq)
THD+N versus Frequency
Acceleration, Velocity and Displacement
Order Analysis
Data Logging
Advanced Programming API