Although bruschetta is a bread-based appetizer, you might not want to have bread, and anyone who is gluten-free or eating low-carb will be wondering about alternatives. The toppings can be served on pita chips, plain or cheese crackers or even on slices of cucumber or a bed of salad leaves. Pizza dough squares would work too. And then you also have gluten-free breads to choose from if gluten is an issue.