I know far more about the Rotax stuff then anything else as I have an electric CS prop (which comes as a kit of parts). Mine is an Arplast PV50 with a CSC-1 control unit;
Lyndhurst Touchdown Services Ltd
There are at least six similar products for the Rotax and MT do a full range of very expensive C of A electric props. A friend of mine flew with a reversible prop which gave amazing short landing capability, they are supposedly very popular in float planes.
Rod1