VertexDSP has released version 2.0 of MultiInspector, with new features and bug fixes.
MultiInspector now incorporates an FFT analysis mode with the following features:

FFT sizes from 512 to 16384 samples.
Several window options: Rectangular, Hann, Hamming, Blackman, Blackman-Harris, Flat Top.
Instant display of the FFT result or smooth display according to the Attack and Release settings.
Switchable semi-transparent display [...]

VertexDSP has released MultiInspector V1.0 and MultiInspectorFree v1.1.
MultiInspector is a 31-band spectral analyzer designed to be used in a multitrack environment and provides an way for simultaneous spectral analysis of several audio signals.
The first instance of MultiInspector behaves like a standard 31-band spectral analyzer. Additional instances automatically send their spectral analysis result to all other [...]