Stevia, Monk Fruit, and Erythritol are some low calorie natural sugars that you can use for making candies.
Dates, figa, apricots, raisins and cranberries can also work as natural sweetners for candies.
Addition of vanilla and almond extracts enhances the sweetness without adding much sugar.
Sweet spices line cinnamon, and nutmeg add a sweet aftertaste.