Arrowroot is a gluten free starch that can be used in place of cornstarch. It thickens at a lower temperature than cornstarch, but you will need to use more.
Can be used in baked goods, sauces and pudding. Some belive there are health benefits as well like soothing an upset stomach.
Also a low calorie starch,at 65 calories per 100g it is less than potato, yam or cassava starches .