Free Signal/Spectrum Analyzer

I ran across this while watching a video tutorial on Synthmaster programming.  Saw the guy using it on his rig and looked it up. 
 
Very useful for soft synth programming, as it lets you have real time visual feedback on the effect your parameter changes have on the sound as you tweak it. You can run two instances of the plugin in the same FX bin, to see both modes at the same time.  The compact GUI view doesn't take up much screen real estate either
 
It is a 32-bit VST .dll only, but seems to run OK on my Splat x64 without any issues.  I'm only using it for sound design, as there are probably better free tools for mixing, such as Span, or Quadcurve EQ.  I really like the signal view, because you can see the phase of the wave.  The blue and green lines show the left and right channel of a stereo signal.
http://www.rs-met.com/freebies.html