Free Spectrum Analyzers

VST

Link Roger Nichols Digital Inspector (vst)
Spectrum analyzer: Peak or Average, Fast or Slow. Customizable alarms for: Headroom, Channel balance, Number of times audio waveform is clipped, Number of consecutive samples clipped, Total number of clipped samples, Peak meters, RMS meters, Channel balance meter, Customizable meter caution and warning zones, Headroom displays/readouts, Clip counters/readouts

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Link Voxengo SPAN (vst)
SPAN is a real-time FFT spectrum analyzer plug-in.

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Link Blue Cat Audio Freqanalyst (vst/direct-x)

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Link ConcreteFx Qspectrum (vst)
Qspec is a free 128 band spectrum analysizer VST plugin.

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Link Bram@Smartelectronix s(M)exoscope (vst)
s(M)exoscope is an oscilloscope VST plugin.You can use it to visually monitor audio wave forms.

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Link Mdsp@smartelectronix Fre(a)koscope (vst)
Fre(a)koscope is an FFT-based real-time spectrum analyzer featuring: lin/log/semitones/third-octave/Bark scales window size selection, frequency zooming, freeze, peak hold, cursor information (amplitude+frequency)

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Link Ag-Works Sonogram SG-1 (vst)
SG-1 gathers some features which are usually isolated in other sonogram tools. It works in real-time. It continues analyzing in the background, and only stops when you freeze it.

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Link Askywhate's Detectcomp (vst)
Realtime multi-criterion numerical analysis :High and low velocity, Stereo deviation, High and low frequency mean, Compression statistical indicator, Peak and RMS progressive values. Velocity Distribution computation, Frequency Distribution computation, Velocity and frequency evolution (20'' / 8' periods).

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Link Bismark bs-spectrum (vst)
bs-spectrum is a spectrum analyzer for Steinberg VST plugin format. it supports Mac OS X and Windows.

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Link Brainspawn Spectr (vst)
SpectR is a 31 band 1/3 octave spectrum analyzer plugin for DirectX and SAWStudio digital audio workstations. SpectR displays real-time frequency response from 11hz to 20khz over an adjustable 100dB range.

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Link Polyfractus Spectrogram (mac only)
Spectrogram is a real-time spectrum analyzer VST plug-in for Macintosh. The spectrum may be shown in 4 different modes: "Spectrograph view" - "Waterfall view/ 3D" - "Spectrogram view" - "Power view"

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Standalone

Link Sound Ruler
Sound Ruler is an analysis, graphing and teaching tool for bioacoustics.

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Link Baudline
Baudline is a real-time signal analysis tool and an offline time-frequency browser. It has a built in tone generation capability and it can play back audio files with a multitude of effects and filters. Designed for environmental analysis missions that range from modulation parameter measurements to searching for transient signals that go bump in the night, baudline combines fast digital signal processing, versatile high speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.


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Link Nauta Sound Emission Analyzer
SEA was developed to have real-time sound analysis capabilities on a Windows PC. Mainly developed for bioacoustic studies, this software can be used for a wide range of applications requiring real-time display of sounds and vibrations.

Link Reliable Software Frequency Analyzer
Fast Fourier Transform (FFT) analysis of the sound.

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Link Oscilloscope
Oscilloscope is a Windows application that converts your PC into a powerful dual-trace oscilloscope.

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Link Spear
SPEAR is an application for audio analysis, editing and synthesis. The analysis procedure (which is based on the traditional McAulay-Quatieri technique) attempts to represent a sound with many individual sinusoidal tracks (partials), each corresponding to a single sinusoidal wave with time varying frequency and amplitude.

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Link VuMeter
With this tool you can analyze things like level, stereo perspective, distortion, phase trouble and frequency content. It is mostly designed for musicians, and for working with music. That's why I didn't spend a lot of time adding a scale showing Hz and dB with numbers.

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Link OscilloMeter - Spectrum Analyzer 5
FFT Spectrum Analyzer is a Set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. Maximum number of channels, sampling frequency ( FS ), bit rate of data, frequency range, precision are limited only by type of used ADC.

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Link VA
Visual Analyzer.

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Link Spectrogram
Spectrogram version 12 is a shareware dual channel audio spectrum analyzer for Windows 98/ME/NT/2000/XP which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card.
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Link Sonogram
Tool to analyze speech and sound signals with methods of fast Fourier transformation (FFT), cepstral analysis, autocorrelation, wavelet-transformation and the linear-predictive-coding method (LPC) which is mostly used in speech recognition.
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Link DSSF3
Sound measurement and analysis software.
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Link Audio Explorer
AudioXplorer is a powerful sound analyzer software designed specifically for MacOS X. AudioXplorer provides real-time analysis window where user can visualize the sound, spectrum and sonogram. It also provides static analysis window: user can record or generate any sound and performs operation on it. Sound from the real-time window can be dragged at any time to the static window for more analysis.
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Add more @ User submissions . . .

Thanks to CC4 from kvraudio for his standalone analyzer submissions.