One popular equivalent is crushed tomatoes. Crushed tomatoes are made by pressing whole, peeled tomatoes through a sieve or food mill.  They have a slightly thicker consistency than stewed tomatoes and a more intense tomato flavor. Another option is to use diced tomatoes.  Diced tomatoes are typically chopped into small pieces, varying in size. They can be more finely chopped than stewed tomatoes, which cook down thicker.