Soritol and xylitol are both used as low-calorie sweeteners. Too much sorbitol can cause gastric distress (I think xylitol has the same issue), which may be why prunes act as a laxative.
D-Allulose (also called D-psicose or just allulose) is also sold as a low-carb sugar. it is one of the rare monosaccharide forms, found in small quantities in wheat, figs and raisins, though I believe that the D-allulose products on the market are synthesized from corn syrup. The FDA has labeled D-allulose as GRAS (Generally Recognized As Safe). My son used some to make a batch of Cardinal Preserves over the weekend.