There are two non-standard options available;
Kelly Aerospace distributes the Therma-Wing option, which is a electric heated leading edge. I'm not sure how this would work in moderate to severe ice where runback ice may be a factor.
Another option was created by NASA but not sure how many aircraft are equiped with it, an extract from an old press release;
RELEASE: 98-37AR
NASA LIGHTWEIGHT 'ICE ZAPPER' TO BE USED ON NEW AIRCRAFT
An innovative NASA ice removal system will be included with the first new general aviation aircraft to be introduced in the United States in 15 years. The lightweight, patented device will zap dangerous ice from wings and other aircraft parts during flight.
Lancair Inc., Bend, OR, will test the ice removal system with its Lancair IV aircraft and make the system available later this summer with the new Columbia 300, a four-seat, general aviation airplane. Even in warm climates, aircraft icing can be a problem at higher altitudes where temperatures are cold.
In 1995, NASA licensed the ice zapper, officially known as the Electro-Expulsive Separation System, to Ice Management Systems, Inc., Temecula, CA, for development and marketing. Ice Management recently agreed to develop the system for Lancair aircraft. The ice zapper could help NASA meet its goal of greatly improving commercial aircraft safety.
"The ice zapper uses one-thousandth the power and is one-tenth the weight of electro-thermal ice removal systems used today," said inventor Leonard Haslim of NASA's Ames Research Center, Moffett Field, CA. "The system pulverizes ice into small particles and removes layers of ice as thin as frost or as thick as an inch of glaze."
Cox manufactures a version of EMEDS for the Premier I and Hawker Horizon.
The Russians may be more advanced on the technology but there is very little information available.