We like to make our own salt free Italian pizza seasoning mix, but also love the flavor and convenience of prepared spice and seasonings mixes, such as Penzey's Pizza Seasoning.
Penzey's Pizza Seasoning is a mixture of fennel seed, oregano, sugar, salt, garlic, black pepper, basil, onion and red pepper. It is a ground mixture, so it adds lots of flavor, but not the flakes of herb that look so attractive in pizza sauce.
Penzey's recommends mixing 1 tablespoon of their pizza seasoning to 1-2 cups of tomato sauce, then brushing on pita bread or a pizza crust. Because of the fennel in the mixture, it gives a nice Italian sausage flavor to foods - they suggest mixing it with ground turkey for sausage flavor without the fat.