While professional studio hardware costs thousands of dollars, several software plugins and system-wide drivers offer this functionality for free.
This is a dedicated 32-band graphic equalizer offering 12 dB of cut or boost in 1/3 octave steps. It is highly regarded for its precision and is available as a VST or AUv3 plugin. 32 band graphic equalizer free download
: A dedicated 32-band graphic equalizer that offers 12 dB of cut or boost in 1/3 octave steps, covering frequencies from 16 Hz to 20 kHz. It is available for both PC and Mac as a plugin. Poweramp Equalizer (Android) 32 band graphic equalizer free download