The 1.0 version of InspectorXL for Mac was provided as a free download on our website. The software lies within Audio & Video Tools, more precisely General.
From the developer:
InspectorXL (a.k.a. IXL) was designed to address the most common analysis tasks with professionalism, style, and finesse. Available as a series of "modules," InspectorXL includes six (6) individual, thoughtfully designed plug-ins for: FFT, spectragram and Third Octave spectral analysis, custom and standard level metering, phase and correlation, balance, stereo image, and statistical clipping and over analysis.