AudioThing has released Blindfold EQ, a freeware EQ plugin, inspired by a quote by Matt Wallace from the book "Recording Unhinged" by Sylvia Massy.
It has 4 bands (LowShelf, LowMid, HighMid, HighShelf), but each knob is blind. There are no indicators or numbers to show frequency values, gain values or Q values.
Price: Free with registration.