EasyQ

Brilliant equaliser. Intuitive and easy-to-learn. Extremely powerful.

Cannot stress how powerful this EQ is. it lets you do everything you could ever want for an EQ: mono controlling, left/right control, unlimited bands, individual changing of mode of band to be highpass, lowpass, high/low shelving, or peak/trough, along with the basic features and shortcuts of scroll for band width/resonance, right click to place a band, left click to remove one.

It even has four different views for stereo/mono viewing and control. That's something I haven't seen an EQ do before, but a convenience I didn't know I needed.

This may be free, but for its convenience and power, against its low CPU load and ease, it's worth a lot. Recommend it to anyone looking for an equalizer.