If you don't want the vinegar smell, what properties of the vinegar are you actually looking for? That will determine what you replace it with. If you are looking for the bite on the tongue in a food product, you might look at other food grade acids as Honclbrif and others suggested - lemon juice, cream of tartar (a tartaric acid salt), malonic acid, phosphoric acid, there are several less smelly ways to make something tart. If you are looking for an acidic reaction (such as making sodium bicarbonate foam), you might want to use a dilute mineral acid like HCl.
If you can tell us what you are trying to use your product for, we might be able to make more helpful suggestions.