EQDemo existed for a little while before it got rolled into CStrip, the Airwindows channel strip! It’s the backbone of CStrip. It’s got Airwindows-style high/mid/low controls, highpass and lowpass, and sweepable crossover points (note: not center points, crossover points).
If you’d like this, you may as well get CStrip and you’ll have it—but if you want it standalone or exactly like it is in the demo, buy CStrip and ask me for the older precursor in an email. I’ll send it.