MTT has designed and built the first turbine outboard motor of its kind. The MTT Turbine Outboard was demonstrated to the US Military in an effort to assist them in fulfilling their mandate,
which states that all equipment onboard its ships must not burn gasoline by the year 2010. The outboard was used to power a landing craft carrying a CJ-7 Jeep, and performed with promising results.
http://www.marineturbine.com/marine.asp
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Yanmar's Diesel Outboards
http://www.yanmar.com.au/marine/d_series/dseries.htm