Freeware : Spectrum Analyzers

All Mac Win AudioLeak by Channel D Software            Leq (Long-Term Equivalent Level) RMS / Peak analyzer   AudioXplorer by Arizona            Sound Analyzer Software   DtBlkFx by Rekkerd            FFT analysis VST  FFTea by Michel Pollet            Real time spectrum analyser   fielder by Sonomatics            a stereo imaging tool for mac   FreqAnalyst by Blue Cat Audio            A free real time spectrum analyzer DX, VST  Frequency by Pandaa Jonas Arstrom            Spectral audio editor   MutilnspectorFree by VertexDSP            31 band spectral analyzer AU, VST  Signal Analyzer by Rs-met            Oscilloscope / spectrum-analyzer VST  Sonic visualiser by Centre for Digital Music            viewing and analysing the contents of music audio files.   Sonogram by Christoph Lauer            Sound Analysis   Sonogram SG-1 by Ag-Works            real-time sonogram VST  SPAN by Voxengo            FFT spectrum analyzer VST  SPEAR by Michael Klingbeil            spectral analysis and editing based on a sinusoidal sound model   WaveTools by MDA-VST            Real time audio analysis tools