Yes, "Green Zebra" is the best known of these types of tomatoes. Aunty Ruby's German Green is another. When the fruit ripens, hardly any color is formed; the tomato stays green but tastes full-bodied. You don't have to worry about the solanine content - this dangerous active ingredient is broken down when “Green Zebra” or any other ripens in the same way as when classic red fruits are ripened.