For Ketogenic recipes, I like to use Lacanto Monkfruit Sweetener with Erythritol (or Swerve). These 0-calorie sweeteners are granulated like sugar and can be used as a 1-to-1 replacement. They're also available in Golden varieties (that are similar to brown sugar) and as confectioner's sugar.  Both are 0-calorie, zero net carbs, non-GMO and non-glycemic (so they don't raise your blood sugar.) However, Swerve can leave a cooling aftertaste, so Lacanto Monkfruit is my favourite choice. For Paleo recipes, I use honey, maple syrup or coconut sugar as erythritol is not permitted.