The IIEQ is a 10-band fully parametric VST EQ for Windows PCs. The goal in designing this equalizer was to create a plugin that is very light on the CPU while offering an amount of sonic control which is not available in the built-in EQs that come with digital audio workstations. Hence the IIEQ is the ideal track EQ, as the user can load many instances without having to suffer from a high CPU load. And, last but not least, the IIEQ is free!
The 10 bands consist of a low- and a high shelf filter with variable gain and cutoff frequency (these are the two bands on the very right and the very left of the user interface that do not offer a Q (i.e. bandwidth) control) plus 8 peaking bands with variable gain, center frequency and Q. All bands can be switched on or off by clicking on the small turqoise buttons on the gain controls. The overall level can be adjusted with the "Out" knob.
Eq31 is a VST 31 band equalizer plugin for Windows OS.
The effect works in mono & stereo mode, without any latency. It requires Pentium II or newer processor.
Voxengo Overtone GEQ: Overtone GEQ is a 7-band harmonic (overtone) graphic equalizer with multi-channel support (supporting up to 8 input/output channels, host setup dependent: if you are using audio host application that conforms to VST specification of version below 2.3, 2 plug-in channels will be available only). Overtone GEQ offers extensive internal channel routing capabilities, and supports mid/side processing.
Beside equalizing, Overtone GEQ applies harmonic enhancement processing. That is why Overtone GEQ is comparably CPU-heavy: it uses 7 harmonic enhancement modules, one for each EQ band. This generates complex harmonic coloration you will probably like a lot.
Since Overtone GEQ implements graphic equalizing by using an array of bell-shaped EQ bands--when you boost/cut adjacent bands--the actual boost or cut may go over the visual setting.
Overtone GEQ conforms to VST specification version 2.4, and so it is able to interface with audio host applications in full 64-bit floating point resolution (if supported by host application).