BetabugsAudio have released MONSTAchorus, a free VST/AU chorus plug-in for Windows and MacOS X.

MONSTAchorus is a true analog style stereo chorus effect with a simple set of controls and fantastic sound quality. It features the usual depth and speed controls, plus a mixture knob to control the ratio of original to effected signal. Astute musicians will also notice that 2 of the knobs go to 13, a clear difference of "3" more points of quality compared to other plug-ins!