http://web.ukonline.co.uk/taosynth/
Found this by chance while looking for guides on sound effects design. Check out the examples page - it produces some really interesting and realistic sounding instruments.
Unfortunately, looking at the dates, it most likely has been abandoned, but there's source code and user's manual, so you more programming-oriented guys can probably play around with it some.
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Awesome physical modelling synth
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