MMetronome

MMetronome is a nice free metronome featuring both sound and resizable visual feedback. If you are not happy with the metronome integrated in your DAW, this may do the trick!
MMetronome image
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Other plugins you might be interested in

MAGC

Free

A simple but powerful utility that adjusts the loudness to match the side-chain.

MSpectralPan

Unique
Free

A unique plugin which lets you apply a panorama to each frequency individually.

MDynamicEq

The 2nd most powerful (dynamic) equalizer available, right after MAutoDynamicEq ;).