There are many other artifical sweeteners out there, including xylitol, erythritol, rebiana, etc.
The one I'm the most intrigued by is
isomaltulose.
It may be more commonly known by some by its patented brand name,
Palatinose.
I don't know how amazing it
really is, or if it will ever become inexpensive enough for mass consumption (to actually displace many of other sweeteners from the market), but it continues to be granted approvals for its many bold claims from the FDA and European food/drug/health boards (not sure if it's been approved in Canada). [
link1] [
link2] [
link3] [
link4] [
link5] [
link6]
Pepsi + Whole Earth Sweetener Co. also utilize it in
PureVia (their response to Coke + Cargill's
Truvia), so it therefore already exists in very small concentration is products in the USA such as SoBe Lifewater (again, not sure about their Canadian products).
EDIT: Unfortunately, in my limited research on the product, I haven't yet come across any places to buy it online or in store.