Monk Fruit - Monk Fruit or Lo Han Guo is 300 times sweeter than sugar and is loaded with anti-oxidants, which can actually be a cancer protectant.
Raw Honey - this is best used in moderation due to it's high fructose content, but it is loaded with vitamins and bacteria that can promote good gut health.
Stevia - This is a popular amongst the fitness community, but it is not without it's risks. Gas and bloating are actually common, but stevia has also been associated with adrenal stress, since it's sweet taste mobilizes insulin with no blood sugar rise to bring back to baseline. This causes an adrenal response to mobilize sugar from the liver. Combined with caffeine if you're putting it in your coffee, this is a double whammy strike to your adrenal health. (Plus I hate the taste)
Xylitol, Erythritol, and other Sugar Alcohols - These products do not cause a rise in insulin, but they are also FODMAPS or foods that ferment in the gut. This can cause gas, bloat, and diarrhea. Definitely not recommended for those of us with IBD, IBS, and gut issues.
Acesulfame Potassium, Aspartame, and Sucrolose - each have been shown to potentially have negative effects. The scariest of which is disruption of the gut microbiome. The research is not conclusive yet, but I'd rather be safe than sorry.
Agave Nectar - Pure fructose syrup with no other nutritional value. This will overload liver glycogen and disrupt fat loss.
Cooked Honey - again, pure fructose with all the nutrition having been cooked out of it.