Preheat oven to 350 degrees F. Frease and flour 9x13 in baking pan. In a large bowl, mix together the applesauce, mashed bananas and sugar. Add vanilla and cocoa and mix together. Then ass baking soda, salt and zucchini and mix together. Add flour and nuts and mix together. Spread evenly into a prepared pan. Bake for 25 minutes until brownies spring back when gently touched.