A superb parametric equalizer based on text file editing, the way real audio engineers do it
It's mostly for home theater usage due to "embedded" integration into Windows, but could be useful for other things.
Wanna take out all bass under 120hz and keep your shitty neighbors happy, no problem, just type in:
Filter 1: ON HP Fc 120,0 Hz
http://sourceforge.net/projects/equalizerapo/