spectrum analyser

The Reflex Spectrum Analyzer includes the standard features you'd expect from this category of plugin—such as stereo comparison and the ability to tilt and smooth the display.
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Visualize the spatial sound field, stereo balance, left/right balance spectrum and correlation spectrum in real time...
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Blue Cat's FreqAnalyst is a free spectrum analyzer plug-in that lets you monitor the spectral content of your audio signal in real time.
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Dancelab, consisting of Jay Frog & CPS, proudly present their first free VST plugin for free download. This free parametric EQ plugin has 8 bands which can be isolated, 16 presets and includes a visual Spectrum Analyzer.
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