Sweetener is a food additive which adds the basic taste of sweetness to a food; Artificial sweeteners are sugar substitutes.
Nutritive sweeteners
Sugar alcohols
Honey
Fruits
Syrups, including Maple syrup
Sugar beet syrup
Corn syrup
Cane syrup
Golden syrup
Barley malt syrup
Molasses (treacle)
Brown rice syrup
Agave syrup

Non-nutritive sweeteners
Acesulfame potassium, also known as Sunett
Alitame, also known as Aclame
Aspartame, also known as Equal or Nutrasweet
Sodium Cyclamate
Glycyrrhizin
Lo han guo
Neotame
Perillartine
Saccharin, also known as Sweet 'n' Low
Stevioside
Sucralose, also known as SucraPlus and Splenda
Sugar of lead, also known as Lead(II) acetate (obsolete due to excessive toxicity)
Inulin