Stevia

Haven't tried it, but I do know it's more expensive than Splenda.

Stevia is all-natural. However, Stevia has been linked to impotency and the shrinking of thalamus in lab rats. The FDA said it couldn't be marketed as a sweetener. So, it conveniently labeled as a dietary supplement. I bought some online recently. It tastes pretty good, but it didn't mix well with tea. After I mixed in about six packages without tasting the Stevia, I finally gave up.